diff --git a/br/ex/nothing/nothing-invoked-as-reader.rkt b/br/ex/nothing/nothing-invoked-as-reader.rkt
deleted file mode 100644
index e90c683..0000000
--- a/br/ex/nothing/nothing-invoked-as-reader.rkt
+++ /dev/null
@@ -1 +0,0 @@
-#lang reader (submod "nothing.rkt" reader)
\ No newline at end of file
diff --git a/br/ex/nothing/nothing-invoked-as-semantics.rkt b/br/ex/nothing/nothing-invoked-as-semantics.rkt
deleted file mode 100644
index 62219b8..0000000
--- a/br/ex/nothing/nothing-invoked-as-semantics.rkt
+++ /dev/null
@@ -1 +0,0 @@
-#lang s-exp "nothing.rkt"
\ No newline at end of file
diff --git a/br/ex/nothing/nothing.rkt b/br/ex/nothing/nothing.rkt
deleted file mode 100644
index 7f518f2..0000000
--- a/br/ex/nothing/nothing.rkt
+++ /dev/null
@@ -1,39 +0,0 @@
-#lang racket
-(provide (all-from-out racket))
-
-(module reader syntax/module-reader
-  br/ex/nothing/nothing)
-
-#|
-
-#lang racket
-(provide (all-from-out racket))
-
-(module reader racket/base
-  (provide read read-syntax))
-
-|#
-
-#|
-
-(module nothing racket
-  (provide (all-from-out racket))
-  
-  (module reader syntax/module-reader
-    br/ex/nothing))
-
-|#
-
-#|
-
-#lang racket
-
-(module reader syntax/module-reader
-  #:language '(submod br/ex/nothing semantics))
-
-(module semantics racket
-  (provide (all-from-out racket)))
-
-(sleep 100000)
-
-|#
diff --git a/br/ex/simples/expander-only/expander-invoked.rkt b/br/ex/simples/expander-only/expander-invoked.rkt
deleted file mode 100644
index b6dfe6d..0000000
--- a/br/ex/simples/expander-only/expander-invoked.rkt
+++ /dev/null
@@ -1,10 +0,0 @@
-#lang s-exp "expander.rkt"
-
-"asdf"
-
-
-41
-
-1+2i
-
-;; but not foo
\ No newline at end of file
diff --git a/br/ex/simples/expander-only/expander.rkt b/br/ex/simples/expander-only/expander.rkt
deleted file mode 100644
index 9d9310a..0000000
--- a/br/ex/simples/expander-only/expander.rkt
+++ /dev/null
@@ -1,11 +0,0 @@
-#lang br
-(provide (rename-out [simple-module-begin #%module-begin])
-          #%datum #%top-interaction)
-(define #'(simple-module-begin expr ...)
-  #'(#%module-begin
-     (define lines (list expr ...))
-     (display (format "Expressions = ~a" (length lines)))
-     (define numbers (filter number? lines))
-     (unless (zero? (length numbers))
-       (displayln (format ", numbers = ~a" (length numbers)))
-       (apply + numbers))))
\ No newline at end of file
diff --git a/br/ex/simples/rapl/rapl.rkt b/br/ex/simples/rapl/rapl.rkt
deleted file mode 100644
index 4655247..0000000
--- a/br/ex/simples/rapl/rapl.rkt
+++ /dev/null
@@ -1,61 +0,0 @@
-#lang br
-(require racket/function)
-(provide (except-out (all-from-out br) + *)
-         (rename-out [my+ +] [my* *]) ⌊)
-
-(define (⌊ largs rargs)
-  (let ([lenlargs (length largs)]
-        [lenrargs (length rargs)])
-    (cond
-      [(zero? lenlargs)
-       (map (compose1 inexact->exact floor) rargs)]
-      [(= lenlargs lenrargs)
-       (map min
-            largs rargs)])))
-
-(define (my* largs rargs)
-  (let ([lenlargs (length largs)]
-        [lenrargs (length rargs)])
-    (cond
-      [(= lenlargs lenrargs)
-       (map * largs rargs)]
-      [(= 1 lenlargs)
-       (map (curry * (car largs)) rargs)]
-      [(= 1 lenrargs)
-       (my* rargs largs)]
-      [else
-       (error 'length-error)])))
-
-(define (my+ largs rargs)
-  (let ([lenlargs (length largs)]
-        [lenrargs (length rargs)])
-    (cond
-      [(= lenlargs lenrargs)
-       (map + largs rargs)]
-      [(= 1 lenlargs)
-       (map (curry + (car largs)) rargs)]
-      [(= 1 lenrargs)
-       (my+ rargs largs)]
-      [else
-       (error 'length-error)])))
-
-(module reader br
-  (provide read-syntax)
-  (define (read-syntax src-path src-port)
-    (define operators '(+ ⌊ *))
-    (define src-exprs (for/list ([ln (in-lines src-port)]
-                                 #:when (regexp-match #px"\\w" ln))
-                                (format-datum '(begin ~a) ln)))
-    (with-syntax ([(src-expr ...) src-exprs])
-    (syntax->datum #'(module rapl "rapl.rkt"
-        (displayln 'src-expr) ...)))))
-
-
-
-#;(module+ test
-    (require rackunit)
-    (check-equal? (+ '(4) '(7)) '(11))
-    (check-equal? (+ '(3) '(2 4 11 7 5)) '(5 7 14 10 8))
-    (check-equal? (+ '(6 3 8 1) '(3)) '(9 6 11 4))
-    (check-equal? (+ '(6 3 8 1) '(3 6 1 8)) '(9 9 9 9))
-    (check-exn exn:fail? (λ _ (+ '(6 8 1) '(3 6 1 8)))))
\ No newline at end of file
diff --git a/br/ex/simples/rapl/rapltest.rkt b/br/ex/simples/rapl/rapltest.rkt
deleted file mode 100644
index a8f8bc5..0000000
--- a/br/ex/simples/rapl/rapltest.rkt
+++ /dev/null
@@ -1,7 +0,0 @@
-#lang reader (submod "rapl.rkt" reader)
-  
-1 3 3 7 * 8.41
-
-⌊ 8.41
-
-5 ⌊ 8.41
\ No newline at end of file
diff --git a/br/ex/simples/reader-only/reader-invoked.rkt b/br/ex/simples/reader-only/reader-invoked.rkt
deleted file mode 100644
index 124caef..0000000
--- a/br/ex/simples/reader-only/reader-invoked.rkt
+++ /dev/null
@@ -1,3 +0,0 @@
-#lang reader "reader.rkt"
-
-This is a terrible idea, and I should know because I invented it.
\ No newline at end of file
diff --git a/br/ex/simples/reader-only/reader.rkt b/br/ex/simples/reader-only/reader.rkt
deleted file mode 100644
index c730417..0000000
--- a/br/ex/simples/reader-only/reader.rkt
+++ /dev/null
@@ -1,9 +0,0 @@
-#lang br
-(provide read-syntax)
-
-(define (read-syntax src in)
-  (syntax-let ([#'src-str (port->string in)])
-              #'(module no-name racket
-                  (define (scramble str)
-                    (list->string (shuffle (string->list str))))
-                  (regexp-replace* #px"\\w+" src-str scramble))))
diff --git a/br/ex/simples/stack compiler/stack-compiler-invoked.rkt b/br/ex/simples/stack compiler/stack-compiler-invoked.rkt
deleted file mode 100644
index f68b972..0000000
--- a/br/ex/simples/stack compiler/stack-compiler-invoked.rkt	
+++ /dev/null
@@ -1,3 +0,0 @@
-#lang reader "stack-compiler.rkt"
-
-(* (/ 25 14 (expt 5 2)) (/ 2 3 1) (* 10 12 15))
diff --git a/br/ex/simples/stack compiler/stack-compiler.rkt b/br/ex/simples/stack compiler/stack-compiler.rkt
deleted file mode 100644
index cd31835..0000000
--- a/br/ex/simples/stack compiler/stack-compiler.rkt	
+++ /dev/null
@@ -1,33 +0,0 @@
-#lang br
-
-(provide #%top-interaction) ; activates the REPL
-
-;; reader goes first and
-;; 1) converts surface syntax into Rackety expressions (wrapping in `(inst ...)`)
-;; 2) creates a module specifying semantics source (in this case, same module)
-(provide read-syntax)
-(define (read-syntax src-path src-input-port)
-  (define expr-datums (for/list ([src-line (in-lines src-input-port)]
-                                 #:when (regexp-match #px"\\w" src-line))
-                                (format-datum '~a src-line)))
-  (syntax-let ([#'(expr-stx ...) expr-datums]) ; ok to bind with non-syntax
-              #'(module stack-compiler-module "stack-compiler.rkt" 
-                  expr-stx ...)))
-
-
-;; semantics always start with #%module-begin, which unwraps the content of the module and rewraps it
-(provide (rename-out [stack-module-begin #%module-begin]))
-(define #'(stack-module-begin expr ...)
-  #'(#%module-begin
-     (stackify (quote expr)) ...))
-
-
-(define (stackify quoted-expr)
-  (define pushes
-    (let loop ([x quoted-expr])
-      (cond
-        [(list? x)
-         (match-define (list op args ...) x)
-         (append (make-list (sub1 (length args)) op) (flatten (map loop args)))]
-        [else x])))
-  (for-each displayln (map (λ(p) (format "push ~a" p)) (reverse pushes))))
\ No newline at end of file
diff --git a/br/ex/simples/stack/stack-invoked.rkt b/br/ex/simples/stack/stack-invoked.rkt
deleted file mode 100644
index 430242b..0000000
--- a/br/ex/simples/stack/stack-invoked.rkt
+++ /dev/null
@@ -1,21 +0,0 @@
-#lang reader "stack.rkt"
-
-push 15
-push 12
-push 10
-push *
-push *
-push 1
-push 3
-push 2
-push /
-push /
-push 2
-push 5
-push expt
-push 14
-push 25
-push /
-push /
-push *
-push *
\ No newline at end of file
diff --git a/br/ex/simples/stack/stack.rkt b/br/ex/simples/stack/stack.rkt
deleted file mode 100644
index 0a4296b..0000000
--- a/br/ex/simples/stack/stack.rkt
+++ /dev/null
@@ -1,62 +0,0 @@
-#lang br
-
-(provide #%top-interaction) ; activates the REPL
-
-;; reader goes first and
-;; 1) converts surface syntax into Rackety expressions (wrapping in `(inst ...)`)
-;; 2) creates a module specifying semantics source (in this case, same module)
-(provide read-syntax)
-(define (read-syntax src-path src-input-port)
-  (define inst-datums (for/list ([src-line (in-lines src-input-port)]
-                                #:when (regexp-match #px"\\w" src-line))
-                              (format-datum '(inst ~a) src-line)))
-  (syntax-let ([#'(inst-stx ...) inst-datums]) ; ok to bind with non-syntax
-              #'(module stack-lang-module "stack.rkt" 
-                  inst-stx ...)))
-
-(define stack empty)
-
-;; semantics always start with #%module-begin, which unwraps the content of the module and rewraps it
-(provide (rename-out [stack-module-begin #%module-begin]))
-(define #'(stack-module-begin instructions ...)
-  #'(#%module-begin
-     instructions ...
-     (first stack)))
-
-
-;; then file is processed like a normal Racket file.
-
-(provide inst)
-(define (inst . args)
-  (if (<= 1 (length args) 2)
-      (let ([proc (first args)])
-        (apply proc (cdr args)))
-      (void)))
-
-
-(provide push)
-(define (push arg)
-  (display "push: ")
-  (cond
-    [(procedure? arg)
-     (displayln (format "got ~a, replacing ~a and ~a with result"  arg (first stack) (second stack) ))
-     (set! stack (cons (arg (first stack) (second stack)) (cddr stack)))]
-    [else (displayln (format "storing value ~a" arg))
-          (set! stack (cons arg stack))])
-  (displayln stack))
-
-;; exercises
-
-(provide pop)
-(define (pop)
-  (display "pop: ")
-  (displayln (format "got ~a" (car stack)))
-  (set! stack (cdr stack))
-  (displayln stack))
-
-(provide swap)
-(define (swap)
-  (display "swap: ")
-  (displayln (format "~a and ~a" (first stack) (second stack)))
-  (set! stack (list* (second stack) (first stack) (cddr stack)))
-  (displayln stack))
\ No newline at end of file
diff --git a/br/ex/simples/stacker/stacker-lang.rkt b/br/ex/simples/stacker/stacker-lang.rkt
deleted file mode 100644
index 7f382b8..0000000
--- a/br/ex/simples/stacker/stacker-lang.rkt
+++ /dev/null
@@ -1,37 +0,0 @@
-#lang br
-
-(module reader br
-  (define (read-syntax src-path src-port)
-    (define src-strs (port->lines src-port))
-    (define (make-datum str) (format-datum '(dispatch ~a) str))
-    (define src-exprs (map make-datum src-strs))
-    (inject-syntax ([#'(list src-expr ...) src-exprs])
-                   #'(module stacker-mod "stacker-lang.rkt"
-                       src-expr ...)))
-  (provide read-syntax))
-
-(define #'(stacker-module-begin reader-line ...)
-  #'(#%module-begin
-     reader-line ...
-     (display (first stack))))
-(provide (rename-out [stacker-module-begin #%module-begin]))
-
-(define stack (list 0 0))
-(define (push num) (set! stack (cons num stack)))
-
-(define (dispatch arg-1 [arg-2 #f])
-  (cond
-    [(number? arg-2) (push arg-2)]
-    [else
-     (define op arg-1)
-     (define op-result (op (first stack) (second stack)))
-     (set! stack (cons op-result (drop stack 2)))]))
-
-#;(define dispatch
-    (case-lambda
-      [(push num) (push num)]
-      [(stack-op)
-       (define op-result (stack-op (first stack) (second stack)))
-       (set! stack (cons op-result (drop stack 2)))]))
-
-(provide #%top-interaction)
\ No newline at end of file
diff --git a/br/ex/simples/stacker/stacker-test.rkt b/br/ex/simples/stacker/stacker-test.rkt
deleted file mode 100644
index 30c533c..0000000
--- a/br/ex/simples/stacker/stacker-test.rkt
+++ /dev/null
@@ -1,6 +0,0 @@
-#lang reader (submod "stacker-lang.rkt" reader)
-push 4
-push 8
-+
-push 3
-*
\ No newline at end of file