diff --git a/2017/d19/main.rkt b/2017/d19/main.rkt
new file mode 100644
index 0000000..10f6574
--- /dev/null
+++ b/2017/d19/main.rkt
@@ -0,0 +1,43 @@
+#lang br/quicklang
+(require "../helper.rkt")
+(provide read-syntax (rename-out [#%mb #%module-begin]) ★ ★★)
+
+(define (read-syntax path port)
+  (define lines (port->lines port))
+  (strip-context #`(module mod "main.rkt"
+                     #,@(for/list ([datum (in-port read (open-input-string (car lines)))])
+                                  datum)
+                     #,@(cdr lines))))
+
+(define-macro (#%mb STARS LINE ...)
+  #'(#%module-begin
+     (time (STARS (list LINE ...)))))
+
+(define (populate-hash! chars lines)
+  (for* ([(line lidx) (in-indexed lines)]
+         [(c cidx) (in-indexed (string->list line))]
+         #:unless (char=? c #\space))
+        (hash-set! chars (+ lidx (* +i cidx)) c)))
+
+(define (traverse lines #:count-steps [count-steps? #f])
+  (define chars (make-hasheqv))
+  (populate-hash! chars lines)
+  (define start (for/first ([k (in-hash-keys chars)]
+                            #:when (zero? (real-part k)))
+                           k))
+  (define down 1) (define up -1) (define left -i) (define right +i)
+  (let loop ([here start][dir down][path null])
+    (define here-char (hash-ref chars here #f))
+    (cond
+      [here-char
+       (define next-dir (if (char=? here-char #\+)
+                            (if (hash-has-key? chars (+ here (* dir +i))) (* dir +i) (* dir -i))
+                            dir))
+       (loop (+ here next-dir) next-dir (cons here-char path))]
+      [count-steps? (length path)]
+      [else (list->string (filter char-alphabetic? (reverse path)))]))) 
+
+(define (★ lines) (traverse lines))
+
+(define (★★ lines) (traverse lines #:count-steps #t))
+                                   
diff --git a/2017/d19/star1.rkt b/2017/d19/star1.rkt
new file mode 100644
index 0000000..3133185
--- /dev/null
+++ b/2017/d19/star1.rkt
@@ -0,0 +1,202 @@
+#lang reader "main.rkt" ★ ; "LXWCKGRAOY"
+                                                                                                       |                                                                                                 
+   +-+   +-+                                 +-+                   +---+       +-+   +-----------------|-----------------------------------+                                             +---+   +-+ +-+ 
+   | |   | |                                 | |                   |   |       | |   |                 |                                   |                                             |   |   | | | | 
+   | +---+ +---------------------+           | |                   +-----------|-+   |                 |                                   |           +-------------------------------------|---|-+ | | 
+   |                             |           | |                       |       |     |                 |                                   |           |                                 |   |   |   | | 
+   |                       +-------------------------------------+ Y-+ | +-----|-----+                 |                                   |           |   +-----------------------------|---|---|-+ | | 
+   |                       |     |           | |                 |   | | |     |                       |                                   |           |   |                             |   |   | | | | 
+   +-----------------------|-----|-----------+ +-------------------+ +-+ |     +-----+         +-------------------------------------------|-----------|---|-----------------------------|---------|---+ 
+                           |     |                               | |     |           |         |       |                                   |           |   |                             |   |   | | |   
+                           |     |                               | |     |           |         |       |   +---------------------------------+         |   |                             |   +---+ | |   
+                           |     |                               | |     |           |         |       |   |                               | |         |   |                             |         | |   
+                           |     |               +-----------------|-----|-----------|---------------------+                               | |         |   |           +-----------------|---+     | |   
+                           |     |               |               | |     |           |         |       |                                   | |         |   |           |                 |   |     | |   
+   +-------------+     +---|-----|-------------------------------|-|-----------------|-------+ |       |                                   +---------------|-----------|---------------------|-------|-+ 
+   |             |     |   |     |               |               | |     |           |       | |       |                                     |         |   |           |                 |   |     | | | 
+ +-|-------------|-------+ |     |     +-----+   +---------------|---------------+   +-----+ | |     +---------------------------------------|-------------------+     |     +-----------|-+ |     | | | 
+ | |             |     | | |     |     |     |                   | |     |       |         | | |     | |                                     |         |   |     |     |     |           | | |     | | | 
+ | |             |     | | |     |     |     |                   | |     |       |         | +---------|-------------------------------------|-------------|-----------|-+   +-----------+ | |     | | | 
+ | |             |     | | |     |     |     |                   | |     |       |         |   |     | |                                     |         |   |     |     | |                 | |     | | | 
+ | |             |     | | |     |     |     |                   | |     |   +---|-------------|---------------------------------------------|---------|---|-----|-------|---------------+ | |     | | | 
+ | |             |     | | |     |     |     |                   | |     |   |   |         |   |     | |                                     |         |   |     |     | |               | | |     | | | 
+ | |     +---+   |     | | |     |     |     |                   | |     |   |   |         |   |     | +-------------------------------------|---------|---|-----------|-----------------|-|-|---------+ 
+ | |     |   |   |     | | |     |     |     |                   | |     |   |   |         |   |     |                                       |         |   |     |     | |               | | |     | |   
+ | |     |   |   |     | | |     |   +---------------------------|---------------------------+ |     |                                       |         |   |     |     | |   +-+         | | |     | |   
+ | |     |   |   |     | | |     |   | |     |                   | |     |   |   |         | | |     |                                       |         |   |     |     | |   | |         | | |     | |   
+ | |     |   |   |     | | |     |   | |     |               +-----|---------|---|---------|-+ |     |                                       |         |   |     |     | |   | |         | | |   +---+   
+ | |     |   |   |     | | |     |   | |     |               |   | |     |   |   |         |   |     |                                       |         |   |     |     | |   | |         | | |   | |     
+ | |     |   |   |     | | |     | +---------------+     +-------+ |     |   |   |         |   |     |   +---------------------------------------+     |   |     |     | |   | |         | | +-+ | |     
+ | |     |   |   |     | | |     | | | |     |     |     |   |     |     |   |   O         |   |     |   |                                   |   |     |   |     |     | |   | |         | |   | | |     
+ | |     |   | +-------|-|-|-----|-+ | |     |     |     |   |     |     |   |   |         |   |     |   |                                   | +---------+ |     |     | |   | |         | |   | | |     
+ | |     |   | | |     | | |     |   | |     |     |     |   |     |     |   |   |         |   |     |   |                                   | | |     | | |     |     | |   | |         | |   | | |     
+ | |     |   | | |     | | +---------|-------|-----|---------|-----------|-------|---------|---|-----|---------------+                       | | |     | | |     |     | +---------+     | |   | | |     
+ | |     |   | | |     | |       |   | |     |     |     |   |     |     |   |   |         |   |     |   |           |                       | | |     | | |     |     |     | |   |     | |   | | |     
+ +-+     |   | | |     | |       | +-|-------------+     |   | +---|-----|---------------------|---------------------+                     +---|-------|-|-|-----|-----|-----|-|---|-----|-------+ |     
+         |   | | |     | |       | | | |     |           |   | |   |     |   |   |         |   |     |   |                                 | | | |     | | |     |     |     | |   |     | |   |   |     
+         |   | | |     | |       | | | |     |           |   | |   |     |   |   |         +---|---------|-----------------------------------+ | |     | | |     |     |     | |   |     | |   |   |     
+         |   | | |     | |       | | | |     |           |   | |   |     |   |   |             |     |   |                                 |   | |     | | |     |     |     | |   |     | |   |   |     
+         | +-----|-----|-------------|-|-------+         |   | |   |     |   |   |             |     |   |                                 | +-|-+     | | +-----|-----+   +-------------|-|-------+     
+         | | | | |     | |       | | | |     | |         |   | |   |     |   |   |             |     |   |                                 | | |       | |       |         | | |   |     | |   |         
+         | | | | |     | |       | | | |     | |         |   | |   |     |   |   |             |     |   |                                 | | |       | |       |         | | |   |     | |   | +-----+ 
+         | | | | |     | |       | | | |     | |         |   | |   |     |   |   |             |     |   |                                 | | |       | |       |         | | |   |     | |   | |     | 
+   +-----|---|-|-------|-----------|-|-------|-|-------------|-|---|-----|---|-----------------|---------|---------------+                 | +-|-------|-|-------------------|-|---------------|-+     | 
+   |     | | | | |     | |       | | | |     | |         |   | |   |     |   |   |             |     |   |               |                 |   |       | |       |         | | |   |     | |   |       | 
+   |     | | | | |     | |       | | | |     | |         |   | |   |     |   |   |             |     |   |               +---------------------|-+     | |       |         | | |   |     +-|-----------+ 
+   |     | | | | |     | |       | | | |     | |         |   | |   |     |   |   |             |     |   |                                 |   | |     | |       |         | | |   |       |   |         
+   |     | | | | |     | | +---------|-|-----|-+         |   | |   |     |   |   |             |     |   |                                 |   | |     | |       |         | | |   |     +---------+     
+   |     | | | | |     | | |     | | | |     |           |   | |   |     |   |   |             |     |   |                                 |   | |     | |       |         | | |   |     | |   |   |     
+   |     +---|-----------|-----+ | | | |     |           |   | |   |     |   |   |             |   +-|---|-------------+                   |   | | +-------+     |         | | |   |     | |   |   |     
+   |       | | | |     | | |   | | | | |     |           |   | |   |     |   |   |             |   | |   |             |                   |   | | |   | | |     |         | | |   |     | |   |   |     
+ +-----------|---|---------|---|-------|-----|-----------------|---|-------------|-------------|---------+       +-----|-------------------|-------------|------C|---+     | | | +-|-----|-+   |   |     
+ | |       | | | |     | | |   | | | | |     |           |   | |   |     |   |   |             |   | |           |     |                   |   | | |   | | |     |   |     | | | | |     |     |   |     
+ | | +-+ +-----|---------|-|---|-|-----+     |           |   | |   |     |   |   |             |   | |           |     |                   |   | | |   | | |     |   |     | | | | |     |   +-|---|---+ 
+ | | | | | | | | |     | | |   | | | |       |           |   | |   |     |   |   |             |   | |           |     |                   |   | | |   | | |     |   |     | | | | |     |   | |   |   | 
+ | | | | | | | | | +-------|-----|---------+ |           |   | +---|-------------------------------|-|-------+   |     |                   |   | | |   | | |     |   |     | | | | |     |   | |   |   | 
+ | | | | | | | | | |   | | |   | | | |     | |           |   |     |     |   |   |             |   | |       |   |     |                   |   | | |   | | |     |   |     | | | | |     |   | |   |   | 
+ | | | | | | | | | |   | | |   | | | |     +-|-----------|---|-----|-----|-------|-------+     |   | |       |   |     |               +-----+ | | |   | | |     |   |     | | | | |     |   | |   |   | 
+ | | | | | | | | | |   | | |   | | | |       |           |   |     |     |   |   |       |     |   | |       |   |     |               |   | | | | |   | | |     |   |     | | | | |     |   | |   |   | 
+ | | | | | | +-|-|-----|-|-|---------|-------------------|---|-----|-----|-------|-------------|-------------|-------------------------|---|---|---------|-|-+   |   |     | | | | |     |   | |   |   | 
+ | | | | | |   | | |   | | |   | | | |       |           |   |     |     |   |   |       |     |   | |       |   |     |               |   | | | | |   | | | |   |   |     | | | | |     |   | |   |   | 
+ | | | | | |   | | +-+ | | |   | | | |     +-|---------------|-----|---------|---------------------|-|-----------|-------------------------|-|-|---|---|-|-|-|---|-+ |   +-|-+ | | |     |   | |   |   | 
+ | | | | | |   | |   | | | |   | | | |     | |           |   |     |     |   |   |       |     |   | |       |   |     |               |   | | | | |   | | | |   | | |   | |   | | |     |   | |   |   | 
+ | | | +-+ |   | |   | | | |   | | | |     | |           |   |     |     |   |   |       |     |   | |       |   |     |               |   | | | | |   | | | |   | | |   | |   | | |     |   | |   |   | 
+ | | |     |   | |   | | | |   | | | |     | |           |   |     |     |   |   |       |     |   | |       |   |     |               |   | | | | |   | | | |   | | |   | |   | | |     |   | |   |   | 
+ | | |   +-|-+ | |   | | | |   | +-|-|---+ | |           |   | +---|-----|---|---|-+     |     |   | |       |   |     |               |   | | | | |   | | | |   | | |   | |   | | |     |   | |   |   | 
+ | | |   | | | | |   | | | |   |   | |   | | |           |   | |   |     |   |   | |     |     |   | |       |   |     |               |   | | | | |   | | | |   | | |   | |   | | |     |   | |   |   | 
+ | +-----+ | +-------|-|-|-----|---|-|-----------------------------|-----|---|-------------------------------|---|-----|---------------|---|---|---|---|-+ | |   | | |   | |   | | |     |   | |   |   | 
+ |   |     |   | |   | | | |   |   | |   | | |           |   | |   |     |   |   | |     |     |   | |       |   |     |               |   | | | | |   |   | |   | | |   G |   | | |     |   | |   |   | 
+ +-+ |     |   | | +---------------|-|---|-|-|-----------|---|---------------|-----|---------------|---------|---------|---------------|-------|---|---|-----|---|-|-|---|---+ | +-------|-+ | |   |   | 
+   | |     |   | | | | | | |   |   | |   | | |           |   | |   |     |   |   | |     |     |   | |       |   |     |               |   | | | | |   |   | |   | | |   | | | |   |     | | | |   |   | 
+ +-|-----+ |   | | | | | | |   |   | |   | | |           |   | +-------------+   +-------------|---|---+     |   |     |               |   | | | | |   |   | |   | | +-----|-------|-------|-------|---+ 
+ | | |   | |   | | | | | | |   |   | |   | | |           |   |     |     |         |     |     |   | | |     |   |     |               |   | | | | |   |   | |   | |     | | | |   |     | | | |   |     
+ | | | +-|-----|-----|---------|---|-------|-----------------------|-------------------------------|---------|---|-----|---------------|---|---|-----------------|---------|-|-----|-------------+ |     
+ | | | | | |   | | | | | | |   |   | |   | | |           |   |     |     |         |     |     |   | | |     |   |     |               |   | | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | | | +-----|-|-|-|-------|-----|-------|-----------|-----------+   |         |     |     |   | | |     |   |     |               |   | | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | | |     | | | | | | |   |   | |   | | |           |   |     | |   |         |     |     |   | | |     |   |     |               |   | | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | | |     | | | | | | |   |   | |   | | |           |   |     | |   |         |     |     |   | | |     |   |     |               |   | | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | | |     | | | | | | |   |   | |   | | |           |   |     | |   |         |     |     |   | | |     |   |     |               |   | | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | | |     | | | | | | |   |   | | +-|---|-----------------+ +-------|---------+     |     |   | | |     |   |     |           +-------+ | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | | |     | | | | | | |   |   | | | | | |           |   | | | | |   |               |     |   | | |     |   |     |           |   |     | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | | +---------|---+ | |   |   | | | | | |           |   | | | | |   |               |     |   | | |     |   |     |           |   |     | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | |       | | | |   | |   |   | | | | | |           |   | | | | |   |               |     |   | | |     |   |     |           |   |     | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | |       | | | |   | |   |   | | | +-|-------------|-----------+   |               |     |   | | |   +-|---------------------------------|-|-----|---|-|---|-------|-|-|-|---|---------|---------+ 
+ | | | |       | | | |   | |   |   | | |   | |           |   | | | |     |               |     |   | | |   | |   |     |           |   |     | | | |   |   | |   | |     | | | |   |     | | | | | |   | 
+ | | +---------|---|-|---|-+ +-------|-|-----------------|-----|---------|---------------|-+   |   | | |   | |   |     |           |   |     | | | |   |   | |   | |     | | | |   |     | | | | | |   | 
+ | |   |       | | | |   |   | |   | | |   | |           |   | | | |     |               | |   |   | | |   | |   |     |           |   |     | | | |   |   | |   | |     | | | |   |     | | | | | |   | 
+ | +---|-----------|---+ | +-|-|---|-|-----|-------------|---|-|---------------------------|-------|-|---------------------------------|-----|---------+   | |   | |     | | | |   |     | | | +-------+ 
+ |     |       | | | | | | | | |   | | |   | |           |   | | | |     |               | |   |   | | |   | |   |     |           |   |     | | | |       | |   | |     | | | |   |     | | |   | |     
+ |   +-+       | | | | | | | | | +-|---|-----|-----------|-----|---|---+ |               | |   |   | | |   | |   |     |           |   |     | | | |       | |   | |     | | | |   |     | | |   | +---+ 
+ |   |         | | | | | | | | | | | | |   | |           |   | | | |   | |               | |   |   | | |   | |   |     |           |   |     | | | |       | |   | |     | | | |   |     | | |   |     | 
+ |   |         | | | | | | | | | | | | |   | |           |   | | | |   | |   +----K------|-------------------|---------------+     |   |     | | | |       | |   | |     | | | |   |     | | |   |     | 
+ |   |         | | | | | | | | | | | | |   | |           |   | | | |   | |   |           | |   |   | | |   | |   |     |     |     |   |     | | | |       | |   | |     | | | |   |     | | |   |     | 
+ |   |         | | | | | | | | | | | | |   | |           |   | | | | +-|-|---------------|-----------|-|-----|---------------------------------|-------------|-----------+ | | |   |     | | |   | +-+ | 
+ |   |         | | | | | | | | | | | | |   | |           |   | | | | | | |   |           | |   |   | | |   | |   |     |     |     |   |     | | | |       | |   | |       | | |   |     | | |   | | | | 
+ |   |         | | | | +---|---|---|---|---|-|-+         |   | | | | | | |   |           | |   |   | | |   | |   |     |     |     |   |     | | | |       | |   | | +-+   | | |   |     | | |   | | | | 
+ |   |         | | | |   | | | | | | | |   | | |         |   | | | | | | |   |           | |   |   | | |   | |   |     |     |     |   |     | | | |       | |   | | | |   | | |   |     | | |   | | | | 
+ |   |     +---|---------|---|---------|---|-------------|-------------------|-----+     | |   |   | | |   | |   |     |     |     |   |     | | | |       | |   | | | |   | | |   |     | | |   | | | | 
+ |   |     |   | | | |   | | | | | | | |   | | |         |   | | | | | | |   |     |     | |   |   | | |   | |   |     |     |     |   |     | | | |       | |   | | | |   | | |   |     | | |   | | | L 
+ |   |     |   | | | |   | | | | | | | |   | | |         |   | | | | +---|---|-----------|-----|---|-------|-|---|-----|-----|---------|-----|-----|-------|-|---|---|-|-----------|---+ | | | +-|-|-+ | 
+ |   |     |   | | | |   | | | | | | | |   | | |         |   | | | |   | |   |     |     | |   |   | | |   | |   |     |     |     |   |     | | | |       | |   | | | |   | | |   |   | | | | | | |   | 
+ |   |     |   | +---+ +-----|-----|-------|-------------|-----|-|-----------------|-----------|-----------|-|---|---------+ |     |   |     | | | |       | +---|-|---|---|-------+   | | | | | | |   | 
+ |   |     |   |   |   | | | | | | | | |   | | |         |   | | | |   | |   |     |     | |   |   | | |   | |   |     |   | |     |   |     | | | |       |     | | | |   | | |       | | | | | | |   | 
+ |   |     |   |   |   | | | | | | | | |   | | |         |   | | | |   | |   | +-----------|---|---|-|-----|-|---------|-----------|---|-------|-|---------|---------|-|---------------+ | +-|-+ | |   | 
+ |   |     |   |   |   | | | | | | | | |   | | |         |   | | | |   | |   | |   |     | |   |   | | |   | |   |     |   | |     |   |     | | | |       |     | | | |   | | |         |   |   | |   | 
+ | +-|-------------|---|-|---|-|---|-|-|---|-|-|-----------------|-----|-----------|-----|-----------------|-----------|-----|---------------|-|-|---------|-----|-|-|-------|-|-------+ |   |   | |   | 
+ | | |     |   |   |   | | | | | | | | |   | | |         |   | | | |   | |   | |   |     | |   |   | | |   | |   |     |   | |     |   |     | | | |       |     | | | |   | | |       | |   |   | |   | 
+ | | +-----|-----------|-------|---|-|---------|---------|-----|-|-------|-----------------|---|---|---------+   |     |   | |     |   |     | | | |       |     | | | |   | | |       | |   |   | |   | 
+ | |       |   |   |   | | | | | | | | |   | | |         |   | | | |   | |   | |   |     | |   |   | | |   |     |     |   | |     |   |     | | | |       |     | | | |   | | |       | |   |   | |   | 
+ | |       |   +---|---|-----|-+ | | | |   | | +-----------------------|-----|-------------------------|---------------|---------------|-----|-|-+ |       |     | | | |   | | |       | |   |   | |   | 
+ | |       |       |   | | | |   | | | |   | |           |   | | | |   | |   | |   |     | |   |   | | |   |     |     |   | |     |   |     | |   |       |     | | | |   | | |       | |   |   | |   | 
+ | |       |       |   +-|-|-|---|-|---------|-----------|-------|-----|-----|---------------+ |   | | |   |     +-----------|-----|---|---+ | |   +---------+   | | | |   | | |       | |   |   | |   | 
+ | |       |       |     | | |   | | | |   | |           |   | | | |   | |   | |   |     | | | |   | | |   |           |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |     | | |   | | | |   | |           |   | | | |   | | +-|-|---|-----------|-----------+           |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |     | | |   | | | |   | |           |   | | | |   | | | | |   |     | | | |   | | |               |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
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+ | +-------|-------|-----|---|-----|-|-----|-+ | |       | +---|---+ | | | | +-|---------|---|---+ | |           |     |   | |             |   |           | |   | | | | | | |         | |   |   | |     
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+ |   |   | |       |     |   |     | | |   |   | |       | |   |   | | | | |   |   |     |   | | | | |           |     |   | |     |       |   |           | |   | | | | | | |         | |   |   | |     
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+ |   |     |   +-|-|---------|-------|-------------------------------------|---|-----------------------------------|---|---|-|-------------------------|---|---------|-----|-|-----|---|---------|-|---+ 
+ |   |     |   | | |     |   |     | | |   |   |         | |   |   | | | | |   |   |     |   | | | | |           | |   |   | |             |   |       |   | |   |   | |   | |     |   |     |   | |   | 
+ |   |     |   | | |     +---------|---|-------------------|---------------|---|---------|-----|-------------------|-------|---------------------------|-----|---|---|-|---------+ |   |     |   | |   | 
+ |   |     |   | | |         |     | | |   |   |         | |   |   | | | | |   |   |     |   | | | | |           | |   |   | |             |   |       |   | |   |   | |   | |   | |   |     |   | |   | 
+ |   |     |   | | |         |     | | |   |   |         | | +-----------------|---|-----|---|-----|-|-----------|-----|-----+             |   |       |   | |   |   | |   | |   | |   |     |   | |   | 
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+ |   |     |   | +-|-----+   |     +-------|---|-----------|-|---------|---|---+   |   | |   | | | | |           | |   |   |               |   |       |   | | +-|-----|---|-|-------+ |     |   | |   | 
+ |   |     |   | | |         |       | |   |   |         | | | |   | | | | |       |   | |   | | | | |           | |   |   |               |   |       |   | |   |   | |   | |   | | | |     |   | |   | 
+ +---|---------|---|-----------------|-----|---|---------|-|-|-----|---|-----------------|---+ | | | |           | |   |   |               |   |       |   | |   |   | |   | |   | | | |     |   | |   | 
+     |     |   | | |         |       | |   |   |         | | | |   | | | | |       |   | |     | | | |           | |   |   |               |   |       |   | |   |   | |   | |   | | | |     |   | |   | 
+     |     |   | | |         |       | |   |   |         | | | |   | | | | |       |   | |     | | | |           | |   |   |               |   |       |   | |   |   | |   | |   | +-|-|-----|---|---+ | 
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+     |     |   | | |         |       | |   |   |         | | | +-----|-|---|-------+   | |     | | | |           | |   |   |               |   |   +---+   | |   |   | |   | |   |   | |     |   | | | | 
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+     |     |   | +-|-----------------|-------------------|-|-------|---|A|-|---+       | |     | +---|-----------|-|---|---|---------------|---|---|-------|-|-+ |   | |   | |   |   | |     |   | | +-+ 
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+     |     |   | +---------------------|---------------------|-------|-|---+   |       | |     |   | |           | |   |   |               +---------------|-+ | +---|-|---|-----|-----|-----|-----|-+   
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+     |     |   | | |         | +-----------|-------------|-+ +-+   +-|-|-------+       | |     |   | |           | |   |   |                   |   |       |   |   | |       +---|-----|-+ | |   | | |   
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+     |     |   | +-|---------|-------|-------------------------------|-|-----------------------|-----|-----------|-|---|---|-----------------------|-------|-------|-----+   +-----+ | | | | |   | | |   
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+     |     |   |   |         | +-----|-|-------|---------|-----|---------|---------------|-----+   | |           | |   |   |                   |   |   +---|-+ |   | |   |       | | | | +-------|-+ |   
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+     |     |   |   |         | | +---------|---|---------------------|---|-------------------------+ |           | |   |   | +-----------------|---|---|---|-+ | +-|---+ |   +-+ | | | |   | |   |   |   
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+     |     |   |   |         | | |   | |   |   |         |     |     | | |             +-|-----------|-----------------|---------------------------|---|---|-+ +---|-|-|-+   +---+ | +-------|---|---|-+ 
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+     |     |   |   W         | |   |   |   |   |         |     |     | | |               |     |                       |   | |                 |   |       | |   | | |     |   |   |   | | | |       | | 
+   +-------|---|---|---------|-|-----------|-------------------|-------|-----------------|-----|-----------------------|---|-|-----------------|-------------|---|---|-------------|---+ | | |       | | 
+   | |     |   |   |         | |   |   |   |   |         |     |     | | |               |     |                       |   | |                 |   |       | |   | | |     |   |   |     | | |       | | 
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+   | +-------------|---------+ |   |   |   +---|---------------|-------|-+               +-----------------------------|-----+           |     |   +-+     | |   | | |     +---+         | +-|-+     | | 
+   |           |   |           |   |   |       |               |     | |                       |                       |   |             |     |     |     | |   | | |                   |   | |     | | 
+ +-+           +-----------------------------------------------|-----|-----------------+       |                       |   +-+           |     |     |     +-+   | | | +-----------------|-------------+ 
+ |                 |           |   |   |       |               |     | |               |       |                       |     |           |     |     |           | | | |                 |   | |     |   
+ +-----------------------------|-------|-------|---------------------------------------|-------|-----------------------|-----|-----------|-----|-----------------|-----|---------------+ |   | |     |   
+                   |           |   |   |       |               |     | |               |       |                       |     |           |     |     |           | | | |               | |   | |     |   
+                   |           +---|-----------|-----------------------|---------------|-------|-----------------------|-----------------------------|-------------|-|-|---------------|-+   | |     |   
+                   |               |   |       |               |     | |               |       |                       |     |           |     |     |           | | | |               |     | |     |   
+                   |               |   |       |               +-----|-|---------------+       |                       +-----------------------------|-----------|-|-|-----------------|-------------+   
+                   |               |   |       |                     | |                       |                             |           |     |     |           | | | |               |     | |         
+                   |               |   |       +---------------------+ +-----------------------|-----------------------------|-----------------|---------------------|-----------------|-------+         
+                   |               |   |                                                       |                             |           |     |     |           | | | |               |     |           
+                   +---------------+   +-------------------------------------------------------+                             +-----------+     +-----+           +-+ +-+               +-----+           
+                                                                                                                                                                                                         
diff --git a/2017/d19/star2.rkt b/2017/d19/star2.rkt
new file mode 100644
index 0000000..7ac06b7
--- /dev/null
+++ b/2017/d19/star2.rkt
@@ -0,0 +1,202 @@
+#lang reader "main.rkt" ★★ ; 17302
+                                                                                                       |                                                                                                 
+   +-+   +-+                                 +-+                   +---+       +-+   +-----------------|-----------------------------------+                                             +---+   +-+ +-+ 
+   | |   | |                                 | |                   |   |       | |   |                 |                                   |                                             |   |   | | | | 
+   | +---+ +---------------------+           | |                   +-----------|-+   |                 |                                   |           +-------------------------------------|---|-+ | | 
+   |                             |           | |                       |       |     |                 |                                   |           |                                 |   |   |   | | 
+   |                       +-------------------------------------+ Y-+ | +-----|-----+                 |                                   |           |   +-----------------------------|---|---|-+ | | 
+   |                       |     |           | |                 |   | | |     |                       |                                   |           |   |                             |   |   | | | | 
+   +-----------------------|-----|-----------+ +-------------------+ +-+ |     +-----+         +-------------------------------------------|-----------|---|-----------------------------|---------|---+ 
+                           |     |                               | |     |           |         |       |                                   |           |   |                             |   |   | | |   
+                           |     |                               | |     |           |         |       |   +---------------------------------+         |   |                             |   +---+ | |   
+                           |     |                               | |     |           |         |       |   |                               | |         |   |                             |         | |   
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+                           |     |               |               | |     |           |         |       |                                   | |         |   |           |                 |   |     | |   
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+   |             |     |   |     |               |               | |     |           |       | |       |                                     |         |   |           |                 |   |     | | | 
+ +-|-------------|-------+ |     |     +-----+   +---------------|---------------+   +-----+ | |     +---------------------------------------|-------------------+     |     +-----------|-+ |     | | | 
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+         | | | | |     | |       | | | |     | |         |   | |   |     |   |   |             |     |   |                                 | | |       | |       |         | | |   |     | |   | |     | 
+   +-----|---|-|-------|-----------|-|-------|-|-------------|-|---|-----|---|-----------------|---------|---------------+                 | +-|-------|-|-------------------|-|---------------|-+     | 
+   |     | | | | |     | |       | | | |     | |         |   | |   |     |   |   |             |     |   |               |                 |   |       | |       |         | | |   |     | |   |       | 
+   |     | | | | |     | |       | | | |     | |         |   | |   |     |   |   |             |     |   |               +---------------------|-+     | |       |         | | |   |     +-|-----------+ 
+   |     | | | | |     | |       | | | |     | |         |   | |   |     |   |   |             |     |   |                                 |   | |     | |       |         | | |   |       |   |         
+   |     | | | | |     | | +---------|-|-----|-+         |   | |   |     |   |   |             |     |   |                                 |   | |     | |       |         | | |   |     +---------+     
+   |     | | | | |     | | |     | | | |     |           |   | |   |     |   |   |             |     |   |                                 |   | |     | |       |         | | |   |     | |   |   |     
+   |     +---|-----------|-----+ | | | |     |           |   | |   |     |   |   |             |   +-|---|-------------+                   |   | | +-------+     |         | | |   |     | |   |   |     
+   |       | | | |     | | |   | | | | |     |           |   | |   |     |   |   |             |   | |   |             |                   |   | | |   | | |     |         | | |   |     | |   |   |     
+ +-----------|---|---------|---|-------|-----|-----------------|---|-------------|-------------|---------+       +-----|-------------------|-------------|------C|---+     | | | +-|-----|-+   |   |     
+ | |       | | | |     | | |   | | | | |     |           |   | |   |     |   |   |             |   | |           |     |                   |   | | |   | | |     |   |     | | | | |     |     |   |     
+ | | +-+ +-----|---------|-|---|-|-----+     |           |   | |   |     |   |   |             |   | |           |     |                   |   | | |   | | |     |   |     | | | | |     |   +-|---|---+ 
+ | | | | | | | | |     | | |   | | | |       |           |   | |   |     |   |   |             |   | |           |     |                   |   | | |   | | |     |   |     | | | | |     |   | |   |   | 
+ | | | | | | | | | +-------|-----|---------+ |           |   | +---|-------------------------------|-|-------+   |     |                   |   | | |   | | |     |   |     | | | | |     |   | |   |   | 
+ | | | | | | | | | |   | | |   | | | |     | |           |   |     |     |   |   |             |   | |       |   |     |                   |   | | |   | | |     |   |     | | | | |     |   | |   |   | 
+ | | | | | | | | | |   | | |   | | | |     +-|-----------|---|-----|-----|-------|-------+     |   | |       |   |     |               +-----+ | | |   | | |     |   |     | | | | |     |   | |   |   | 
+ | | | | | | | | | |   | | |   | | | |       |           |   |     |     |   |   |       |     |   | |       |   |     |               |   | | | | |   | | |     |   |     | | | | |     |   | |   |   | 
+ | | | | | | +-|-|-----|-|-|---------|-------------------|---|-----|-----|-------|-------------|-------------|-------------------------|---|---|---------|-|-+   |   |     | | | | |     |   | |   |   | 
+ | | | | | |   | | |   | | |   | | | |       |           |   |     |     |   |   |       |     |   | |       |   |     |               |   | | | | |   | | | |   |   |     | | | | |     |   | |   |   | 
+ | | | | | |   | | +-+ | | |   | | | |     +-|---------------|-----|---------|---------------------|-|-----------|-------------------------|-|-|---|---|-|-|-|---|-+ |   +-|-+ | | |     |   | |   |   | 
+ | | | | | |   | |   | | | |   | | | |     | |           |   |     |     |   |   |       |     |   | |       |   |     |               |   | | | | |   | | | |   | | |   | |   | | |     |   | |   |   | 
+ | | | +-+ |   | |   | | | |   | | | |     | |           |   |     |     |   |   |       |     |   | |       |   |     |               |   | | | | |   | | | |   | | |   | |   | | |     |   | |   |   | 
+ | | |     |   | |   | | | |   | | | |     | |           |   |     |     |   |   |       |     |   | |       |   |     |               |   | | | | |   | | | |   | | |   | |   | | |     |   | |   |   | 
+ | | |   +-|-+ | |   | | | |   | +-|-|---+ | |           |   | +---|-----|---|---|-+     |     |   | |       |   |     |               |   | | | | |   | | | |   | | |   | |   | | |     |   | |   |   | 
+ | | |   | | | | |   | | | |   |   | |   | | |           |   | |   |     |   |   | |     |     |   | |       |   |     |               |   | | | | |   | | | |   | | |   | |   | | |     |   | |   |   | 
+ | +-----+ | +-------|-|-|-----|---|-|-----------------------------|-----|---|-------------------------------|---|-----|---------------|---|---|---|---|-+ | |   | | |   | |   | | |     |   | |   |   | 
+ |   |     |   | |   | | | |   |   | |   | | |           |   | |   |     |   |   | |     |     |   | |       |   |     |               |   | | | | |   |   | |   | | |   G |   | | |     |   | |   |   | 
+ +-+ |     |   | | +---------------|-|---|-|-|-----------|---|---------------|-----|---------------|---------|---------|---------------|-------|---|---|-----|---|-|-|---|---+ | +-------|-+ | |   |   | 
+   | |     |   | | | | | | |   |   | |   | | |           |   | |   |     |   |   | |     |     |   | |       |   |     |               |   | | | | |   |   | |   | | |   | | | |   |     | | | |   |   | 
+ +-|-----+ |   | | | | | | |   |   | |   | | |           |   | +-------------+   +-------------|---|---+     |   |     |               |   | | | | |   |   | |   | | +-----|-------|-------|-------|---+ 
+ | | |   | |   | | | | | | |   |   | |   | | |           |   |     |     |         |     |     |   | | |     |   |     |               |   | | | | |   |   | |   | |     | | | |   |     | | | |   |     
+ | | | +-|-----|-----|---------|---|-------|-----------------------|-------------------------------|---------|---|-----|---------------|---|---|-----------------|---------|-|-----|-------------+ |     
+ | | | | | |   | | | | | | |   |   | |   | | |           |   |     |     |         |     |     |   | | |     |   |     |               |   | | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | | | +-----|-|-|-|-------|-----|-------|-----------|-----------+   |         |     |     |   | | |     |   |     |               |   | | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | | |     | | | | | | |   |   | |   | | |           |   |     | |   |         |     |     |   | | |     |   |     |               |   | | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | | |     | | | | | | |   |   | |   | | |           |   |     | |   |         |     |     |   | | |     |   |     |               |   | | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | | |     | | | | | | |   |   | |   | | |           |   |     | |   |         |     |     |   | | |     |   |     |               |   | | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | | |     | | | | | | |   |   | | +-|---|-----------------+ +-------|---------+     |     |   | | |     |   |     |           +-------+ | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | | |     | | | | | | |   |   | | | | | |           |   | | | | |   |               |     |   | | |     |   |     |           |   |     | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | | +---------|---+ | |   |   | | | | | |           |   | | | | |   |               |     |   | | |     |   |     |           |   |     | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | |       | | | |   | |   |   | | | | | |           |   | | | | |   |               |     |   | | |     |   |     |           |   |     | | | |   |   | |   | |     | | | |   |     | | | | | |     
+ | | | |       | | | |   | |   |   | | | +-|-------------|-----------+   |               |     |   | | |   +-|---------------------------------|-|-----|---|-|---|-------|-|-|-|---|---------|---------+ 
+ | | | |       | | | |   | |   |   | | |   | |           |   | | | |     |               |     |   | | |   | |   |     |           |   |     | | | |   |   | |   | |     | | | |   |     | | | | | |   | 
+ | | +---------|---|-|---|-+ +-------|-|-----------------|-----|---------|---------------|-+   |   | | |   | |   |     |           |   |     | | | |   |   | |   | |     | | | |   |     | | | | | |   | 
+ | |   |       | | | |   |   | |   | | |   | |           |   | | | |     |               | |   |   | | |   | |   |     |           |   |     | | | |   |   | |   | |     | | | |   |     | | | | | |   | 
+ | +---|-----------|---+ | +-|-|---|-|-----|-------------|---|-|---------------------------|-------|-|---------------------------------|-----|---------+   | |   | |     | | | |   |     | | | +-------+ 
+ |     |       | | | | | | | | |   | | |   | |           |   | | | |     |               | |   |   | | |   | |   |     |           |   |     | | | |       | |   | |     | | | |   |     | | |   | |     
+ |   +-+       | | | | | | | | | +-|---|-----|-----------|-----|---|---+ |               | |   |   | | |   | |   |     |           |   |     | | | |       | |   | |     | | | |   |     | | |   | +---+ 
+ |   |         | | | | | | | | | | | | |   | |           |   | | | |   | |               | |   |   | | |   | |   |     |           |   |     | | | |       | |   | |     | | | |   |     | | |   |     | 
+ |   |         | | | | | | | | | | | | |   | |           |   | | | |   | |   +----K------|-------------------|---------------+     |   |     | | | |       | |   | |     | | | |   |     | | |   |     | 
+ |   |         | | | | | | | | | | | | |   | |           |   | | | |   | |   |           | |   |   | | |   | |   |     |     |     |   |     | | | |       | |   | |     | | | |   |     | | |   |     | 
+ |   |         | | | | | | | | | | | | |   | |           |   | | | | +-|-|---------------|-----------|-|-----|---------------------------------|-------------|-----------+ | | |   |     | | |   | +-+ | 
+ |   |         | | | | | | | | | | | | |   | |           |   | | | | | | |   |           | |   |   | | |   | |   |     |     |     |   |     | | | |       | |   | |       | | |   |     | | |   | | | | 
+ |   |         | | | | +---|---|---|---|---|-|-+         |   | | | | | | |   |           | |   |   | | |   | |   |     |     |     |   |     | | | |       | |   | | +-+   | | |   |     | | |   | | | | 
+ |   |         | | | |   | | | | | | | |   | | |         |   | | | | | | |   |           | |   |   | | |   | |   |     |     |     |   |     | | | |       | |   | | | |   | | |   |     | | |   | | | | 
+ |   |     +---|---------|---|---------|---|-------------|-------------------|-----+     | |   |   | | |   | |   |     |     |     |   |     | | | |       | |   | | | |   | | |   |     | | |   | | | | 
+ |   |     |   | | | |   | | | | | | | |   | | |         |   | | | | | | |   |     |     | |   |   | | |   | |   |     |     |     |   |     | | | |       | |   | | | |   | | |   |     | | |   | | | L 
+ |   |     |   | | | |   | | | | | | | |   | | |         |   | | | | +---|---|-----------|-----|---|-------|-|---|-----|-----|---------|-----|-----|-------|-|---|---|-|-----------|---+ | | | +-|-|-+ | 
+ |   |     |   | | | |   | | | | | | | |   | | |         |   | | | |   | |   |     |     | |   |   | | |   | |   |     |     |     |   |     | | | |       | |   | | | |   | | |   |   | | | | | | |   | 
+ |   |     |   | +---+ +-----|-----|-------|-------------|-----|-|-----------------|-----------|-----------|-|---|---------+ |     |   |     | | | |       | +---|-|---|---|-------+   | | | | | | |   | 
+ |   |     |   |   |   | | | | | | | | |   | | |         |   | | | |   | |   |     |     | |   |   | | |   | |   |     |   | |     |   |     | | | |       |     | | | |   | | |       | | | | | | |   | 
+ |   |     |   |   |   | | | | | | | | |   | | |         |   | | | |   | |   | +-----------|---|---|-|-----|-|---------|-----------|---|-------|-|---------|---------|-|---------------+ | +-|-+ | |   | 
+ |   |     |   |   |   | | | | | | | | |   | | |         |   | | | |   | |   | |   |     | |   |   | | |   | |   |     |   | |     |   |     | | | |       |     | | | |   | | |         |   |   | |   | 
+ | +-|-------------|---|-|---|-|---|-|-|---|-|-|-----------------|-----|-----------|-----|-----------------|-----------|-----|---------------|-|-|---------|-----|-|-|-------|-|-------+ |   |   | |   | 
+ | | |     |   |   |   | | | | | | | | |   | | |         |   | | | |   | |   | |   |     | |   |   | | |   | |   |     |   | |     |   |     | | | |       |     | | | |   | | |       | |   |   | |   | 
+ | | +-----|-----------|-------|---|-|---------|---------|-----|-|-------|-----------------|---|---|---------+   |     |   | |     |   |     | | | |       |     | | | |   | | |       | |   |   | |   | 
+ | |       |   |   |   | | | | | | | | |   | | |         |   | | | |   | |   | |   |     | |   |   | | |   |     |     |   | |     |   |     | | | |       |     | | | |   | | |       | |   |   | |   | 
+ | |       |   +---|---|-----|-+ | | | |   | | +-----------------------|-----|-------------------------|---------------|---------------|-----|-|-+ |       |     | | | |   | | |       | |   |   | |   | 
+ | |       |       |   | | | |   | | | |   | |           |   | | | |   | |   | |   |     | |   |   | | |   |     |     |   | |     |   |     | |   |       |     | | | |   | | |       | |   |   | |   | 
+ | |       |       |   +-|-|-|---|-|---------|-----------|-------|-----|-----|---------------+ |   | | |   |     +-----------|-----|---|---+ | |   +---------+   | | | |   | | |       | |   |   | |   | 
+ | |       |       |     | | |   | | | |   | |           |   | | | |   | |   | |   |     | | | |   | | |   |           |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |     | | |   | | | |   | |           |   | | | |   | | +-|-|---|-----------|-----------+           |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |     | | |   | | | |   | |           |   | | | |   | | | | |   |     | | | |   | | |               |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |     | | |   | | | |   | |           |   | | | |   | | | | |   |     | | | |   | | |               |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |     | | |   | | | |   | |           |   | | | |   | | | | |   |     | | | |   | | |               |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |     | | |   | | | |   | |           |   | | | |   | | | | |   |     | | | |   | | |               |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |     | | |   | | | |   | |           |   | | | |   | | | | |   |     | | | |   | | |               |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |   +---------+ | | |   | | +---------|-------+ |   | | | | |   |     | | | |   | | |               |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |   | | | |     | | |   | | |         |   | |   |   | | | | |   |     | | | |   | | |               |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |   | | | | +---|---|---|-----------------|-|-------|-------|---|-----------|---|---+               |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |   | | | | |   | | |   | | |         |   | |   |   | | | | |   |     | | | |   | |                 |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |   | | | | |   | | |   | | |         |   | |   |   | | | | |   |     | | | |   | |                 |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |   | | | | |   | | |   | | |         |   | |   |   | | | | |   |     | | | |   | |                 |   | |     |   |   | | |           | |   | | | |   | | |       | |   |   | |   | 
+ | |       |       |   | | | | |   | | |   | | |         |   | |   | +---|-----|---------|-|-|-|---|-------------------|-----------|-------|-----------------|-----|---------|-+       | |   |   | |   | 
+ | |       |       |   | | | | |   | | |   | | |         |   | |   | | | | | | |   |     | | | |   | |                 |   | |     |   |   | | |           | |   | | | |   | |         | |   |   | |   | 
+ | +-+     |       |   +-|---------|---|-----|-|---------|---|-|-----------|-|-|---------|-+ | |   | |                 |   | |     +---|-----+ |           | |   | | | | +-|---+       | |   |   | |   | 
+ |   |     |       |     | | | |   | | |   | | |         |   | |   | | | | | | |   |     |   | |   | |                 |   | |         |   |   |           | |   | | | | | | | |       | |   |   | |   | 
+ |   |     |       |     | | | |   | | |   | | |         |   | |   | | | | | | |   |     |   | |   | |                 |   | |         +---|-----------------|-----------|-|---|-------|-----|-----|---+ 
+ |   |     |       |     | | | |   | | |   | | |         |   | |   | | | | | | |   |     |   | |   | |                 |   | |             |   |           | |   | | | | | | | |       | |   |   | |     
+ | +-----+ |       |     | +---------------------+       |   | |   +---|---|-|-----------|---|-|---|-|-----------------------|-------------|---------------|---------|-|-|-|---+       | |   |   | |     
+ | | |   | |       |     |   | |   | | |   | | | |       |   | |     | | | | | |   |     |   | |   | |                 |   | |             |   |           | |   | | | | | | |         | |   |   | |     
+ | | |   | |       |     |   | |   | | |   | | | |       |   | |     | | | | | |   |     |   | |   | |                 |   | |             |   |           | |   | | | | | | |         | |   |   | |     
+ | | |   | |       |     |   | |   | | |   | | | |       |   | |     | | | | | |   |     |   | |   | |                 |   | |             |   |           | |   | | | | | | |         | |   |   | |     
+ | | |   | |       |     |   | |   | | |   | | | |       |   +-------------|-|-|---|---------|-|-----|-----------+     |   | |             |   |           | |   | | | | | | |         | |   |   | |     
+ | | |   | |       |     |   | |   | | |   | | | |       |     |     | | | | | |   |     |   | |   | |           |     |   | |             |   |           | |   | | | | | | |         | |   |   | |     
+ | +-------|-------|-----|---|-----|-|-----|-+ | |       | +---|---+ | | | | +-|---------|---|---+ | |           |     |   | |             |   |           | |   | | | | | | |         | |   |   | |     
+ |   |   | |       |     |   | |   | | |   |   | |       | |   |   | | | | |   |   |     |   | | | | |           |     |   | |             |   |           | |   | | | | | | |         | |   |   | |     
+ |   |   | |       |     |   | |   | | |   |   | |       | |   |   | | | | |   |   |     |   | | | | |           |     |   | |             |   |           | |   | | | | | | |         | |   |   | |     
+ |   |   | |       |     |   | |   | | |   |   | |       | |   |   | | | | |   |   |     |   | | | | |           |     |   | |             |   |           | |   | | | | | | |         | |   |   | |     
+ |   |   | |       |     |   | |   | | |   |   | |       | |   |   | | | | |   |   |     |   | | | | |           |     |   | |             |   |           | |   | | | | | | |         | |   |   | |     
+ |   |   | |       |     |   | |   | | |   |   | |       | |   |   | | | | |   |   |     |   | | | | |           |     |   | |             |   |           | |   | | | | | | |         | |   |   | |     
+ |   |   | |       |     |   | +---|---|---|---|-|-------------|---------|-----|---|-----|---|-----|-|-----------|---------|-------+       |   |           | |   | | | | | | |         | |   |   | |     
+ |   |   | |       |     |   |     | | |   |   | |       | |   |   | | | | |   |   |     |   | | | | |           |     |   | |     |       |   |           | |   | | | | | | |         | |   |   | |     
+ |   |   +-------+ |     |   |     | | |   |   | +-------|-|---|---|---|---|---|---------|-----|-|---|-------------+   |   | +-----|-------|---|-+   +-----|-------|-----+ | |         | |   |   | |     
+ |   |     |     | |     |   |     | | |   |   |         | |   |   | | | | |   |   |     |   | | | | |           | |   |   |       |       |   | |   |     | |   | | | |   | |         | |   |   | |     
+ |   |     |     | |     |   |     | | |   |   |         | |   |   | | | | |   |   |     |   | | | | |           | |   |   | +-----+       |   | +---|-+   | |   | +-|-|---------------|-+   |   | |     
+ |   |     |     | |     |   |     | | |   |   |         | |   |   | | | | |   |   |     |   | | | | |           | |   |   | |             |   |     | |   | |   |   | |   | |         |     |   | |     
+ |   |     |     | |     |   |     | | |   |   |         | |   |   | | | | |   |   |     |   | | | | |           | |   |   | |             |   |     +-|---|-|---|---|-------|-----+   |     |   | |     
+ |   |     |     | |     |   |     | | |   |   |         | |   |   | | | | |   |   |     |   | | | | |           | |   |   | |             |   |       |   | |   |   | |   | |     |   |     |   | |     
+ |   |     |   +-|-|---------|-------|-------------------------------------|---|-----------------------------------|---|---|-|-------------------------|---|---------|-----|-|-----|---|---------|-|---+ 
+ |   |     |   | | |     |   |     | | |   |   |         | |   |   | | | | |   |   |     |   | | | | |           | |   |   | |             |   |       |   | |   |   | |   | |     |   |     |   | |   | 
+ |   |     |   | | |     +---------|---|-------------------|---------------|---|---------|-----|-------------------|-------|---------------------------|-----|---|---|-|---------+ |   |     |   | |   | 
+ |   |     |   | | |         |     | | |   |   |         | |   |   | | | | |   |   |     |   | | | | |           | |   |   | |             |   |       |   | |   |   | |   | |   | |   |     |   | |   | 
+ |   |     |   | | |         |     | | |   |   |         | | +-----------------|---|-----|---|-----|-|-----------|-----|-----+             |   |       |   | |   |   | |   | |   | |   |     |   | |   | 
+ |   |     |   | | |         |     | | |   |   |         | | | |   | | | | |   |   |     |   | | | | |           | |   |   |               |   |       |   | |   |   | |   | |   | |   |     |   | |   | 
+ |   |     |   | +-|-----+   |     | | |   |   |         | | | |   | | | | |   |   |   +-----|-|-----|-------------|---|-----------------------------------|-|-+ |   | |   | |   | |   |     |   | |   | 
+ |   |     |   |   |     |   |     | | |   |   |         | | | |   | | | | |   |   |   | |   | | | | |           | |   |   |               |   |       |   | | | |   | |   | |   | |   |     |   | |   | 
+ |   |     |   | +-|-----+   |     +-------|---|-----------|-|---------|---|---+   |   | |   | | | | |           | |   |   |               |   |       |   | | +-|-----|---|-|-------+ |     |   | |   | 
+ |   |     |   | | |         |       | |   |   |         | | | |   | | | | |       |   | |   | | | | |           | |   |   |               |   |       |   | |   |   | |   | |   | | | |     |   | |   | 
+ +---|---------|---|-----------------|-----|---|---------|-|-|-----|---|-----------------|---+ | | | |           | |   |   |               |   |       |   | |   |   | |   | |   | | | |     |   | |   | 
+     |     |   | | |         |       | |   |   |         | | | |   | | | | |       |   | |     | | | |           | |   |   |               |   |       |   | |   |   | |   | |   | | | |     |   | |   | 
+     |     |   | | |         |       | |   |   |         | | | |   | | | | |       |   | |     | | | |           | |   |   |               |   |       |   | |   |   | |   | |   | +-|-|-----|---|---+ | 
+     |     X   | | |         |       | |   |   |         | | | |   | | | | |       |   | |     | | | |           | |   |   |               |   |       |   | |   |   | |   | |   |   | |     |   | | | | 
+     |     |   | | |         |       | |   |   |         | | | +-----|-|---|-------+   | |     | | | |           | |   |   |               |   |   +---+   | |   |   | |   | |   |   | |     |   | | | | 
+     |     |   | | |         |       | |   |   |         | | |     | | | | |           | |     | | | |           | |   |   |               |   |   |       | |   |   | |   | |   |   | |     |   | | | | 
+     |     |   | +-|-----------------|-------------------|-|-------|---|A|-|---+       | |     | +---|-----------|-|---|---|---------------|---|---|-------|-|-+ |   | |   | |   |   | |     |   | | +-+ 
+     |     |   |   |         |       | |   |   |         | | |     | | | | |   |       | |     |   | |           | |   |   |               |   |   |       | | | |   | |   | |   |   | |     |   | |     
+     |     |   | +---------------------|---------------------|-------|-|---+   |       | |     |   | |           | |   |   |               +---------------|-+ | +---|-|---|-----|-----|-----|-----|-+   
+     |     |   | | |         |       | |   |   |         | | |     | | | |     |       | |     |   | |           | |   |   |                   |   |       |   |     | |   | |   |   | |     |   | | |   
+     |     |   | | |         | +-----|-----|-----------------------------|---------------|-----|-----|-------------|---|-----------------------|---|-------|---|---+ | +---+ +---|---|-|---+ |   | | |   
+     |     |   | | |         | |     | |   |   |         | | |     | | | |     |       | |     |   | |           | |   |   |                   |   |       |   |   | |           |   | |   | |   | | |   
+     |     |   | | |         | +-----------|-------------|-+ +-+   +-|-|-------+       | |     |   | |           | |   |   |                   |   |       |   |   | |       +---|-----|-+ | |   | | |   
+     |     |   | | |         |       | |   |   |         |     |     | | |             | |     |   | |           | |   |   |                   |   |       |   |   | |       |   |   | | | | |   | | |   
+     |     |   | +-|---------|-------|-------------------------------|-|-----------------------|-----|-----------|-|---|---|-----------------------|-------|-------|-----+   +-----+ | | | | |   | | |   
+     |     |   |   |         |       | |   |   |         |     |     | | |             | |     |   | |           | |   |   |                   |   |       |   |   | |   |       | | | | | | |   | | |   
+     |     |   |   |         | +-----|-|-------|---------|-----|---------|---------------|-----+   | |           | |   |   |                   |   |   +---|-+ |   | |   |       | | | | +-------|-+ |   
+     |     |   |   |         | |     | |   |   |         |     |     | | |             | |         | |           | |   |   |                   |   |   |   | | |   | |   |       | | | |   | |   |   |   
+     |     |   |   |         | | +---------|---|---------------------|---|-------------------------+ |           | |   |   | +-----------------|---|---|---|-+ | +-|---+ |   +-+ | | | |   | |   |   |   
+     |     |   |   |         | | |   | |   |   |         |     |     | | |             | |           |           | |   |   | |                 |   |   |   |   | | | | | |   | | | | | |   | |   |   |   
+     |     |   |   |         | | |   | |   |   |         |     |     | | |             +-|-----------|-----------------|---------------------------|---|---|-+ +---|-|-|-+   +---+ | +-------|---|---|-+ 
+     |     |   |   |         | | |   | |   |   |         |     |     | | |               |           |           | |   |   | |                 |   |   |   | |   | | | |       |   |   |   | |   |   | | 
+     |     |   |   |         | | +-+ +-----|---|---------------|---------|---------------|-----+     +-----------+ +-------|-----------------------|---+   | |   | | | +---+   |   |   | +---|---+   | | 
+     |     |   |   W         | |   |   |   |   |         |     |     | | |               |     |                       |   | |                 |   |       | |   | | |     |   |   |   | | | |       | | 
+   +-------|---|---|---------|-|-----------|-------------------|-------|-----------------|-----|-----------------------|---|-|-----------------|-------------|---|---|-------------|---+ | | |       | | 
+   | |     |   |   |         | |   |   |   |   |         |     |     | | |               |     |                       |   | |                 |   |       | |   | | |     |   |   |     | | |       | | 
+   | |     +-----------------|-|---|-------|-------------+     |     | | |               |     |                       |   | |           +-----|-----------------|-|------R|---|---+     | | |       | | 
+   | |         |   |         | |   |   |   |   |               |     | | |               |     |                       |   | |           |     |   |       | |   | | |     |   |         | | |       | | 
+   | +-------------|---------+ |   |   |   +---|---------------|-------|-+               +-----------------------------|-----+           |     |   +-+     | |   | | |     +---+         | +-|-+     | | 
+   |           |   |           |   |   |       |               |     | |                       |                       |   |             |     |     |     | |   | | |                   |   | |     | | 
+ +-+           +-----------------------------------------------|-----|-----------------+       |                       |   +-+           |     |     |     +-+   | | | +-----------------|-------------+ 
+ |                 |           |   |   |       |               |     | |               |       |                       |     |           |     |     |           | | | |                 |   | |     |   
+ +-----------------------------|-------|-------|---------------------------------------|-------|-----------------------|-----|-----------|-----|-----------------|-----|---------------+ |   | |     |   
+                   |           |   |   |       |               |     | |               |       |                       |     |           |     |     |           | | | |               | |   | |     |   
+                   |           +---|-----------|-----------------------|---------------|-------|-----------------------|-----------------------------|-------------|-|-|---------------|-+   | |     |   
+                   |               |   |       |               |     | |               |       |                       |     |           |     |     |           | | | |               |     | |     |   
+                   |               |   |       |               +-----|-|---------------+       |                       +-----------------------------|-----------|-|-|-----------------|-------------+   
+                   |               |   |       |                     | |                       |                             |           |     |     |           | | | |               |     | |         
+                   |               |   |       +---------------------+ +-----------------------|-----------------------------|-----------------|---------------------|-----------------|-------+         
+                   |               |   |                                                       |                             |           |     |     |           | | | |               |     |           
+                   +---------------+   +-------------------------------------------------------+                             +-----------+     +-----+           +-+ +-+               +-----+           
+                                                                                                                                                                                                         
diff --git a/2017/d19/test1.rkt b/2017/d19/test1.rkt
new file mode 100644
index 0000000..0956af5
--- /dev/null
+++ b/2017/d19/test1.rkt
@@ -0,0 +1,7 @@
+#lang reader "main.rkt" ★ ; "ABCDEF"
+     |          
+     |  +--+    
+     A  |  C    
+ F---|----E|--+ 
+     |  |  |  D 
+     +B-+  +--+ 
diff --git a/2017/d19/test2.rkt b/2017/d19/test2.rkt
new file mode 100644
index 0000000..53987a2
--- /dev/null
+++ b/2017/d19/test2.rkt
@@ -0,0 +1,7 @@
+#lang reader "main.rkt" ★★ ; 38
+     |          
+     |  +--+    
+     A  |  C    
+ F---|----E|--+ 
+     |  |  |  D 
+     +B-+  +--+