diff --git a/2017/d12/main.rkt b/2017/d12/main.rkt
new file mode 100644
index 0000000..4a70a81
--- /dev/null
+++ b/2017/d12/main.rkt
@@ -0,0 +1,28 @@
+#lang reader "../aoc-lang.rkt"
+(require graph)
+(provide (rename-out [#%mb #%module-begin]))
+
+(define-macro (#%mb (STARS) (NUM <-> . NUMS) ...)
+  #'(#%module-begin
+     (define g (unweighted-graph/undirected null))
+     (for-each (curry add-edge! g NUM) (list . NUMS)) ...     
+     (if (eq? 'STARS '★)
+         (programs-in-group g 0)
+         (number-of-groups g (list NUM ...)))))
+
+(define (programs-in-group g x) (length (group-of g x)))
+
+(define (group-of g x)
+  (define-values (connects _) (dijkstra g x))
+  (for/list ([(k v) (in-hash connects)]
+             #:when (integer? v))
+    k))
+
+(define (number-of-groups g nums)
+  (for/fold ([nums-seen null]
+             [group-count 0]
+             #:result group-count)
+            ([num (in-list nums)]
+             #:unless (memv num nums-seen))
+    (values (append (group-of g num) nums-seen) (add1 group-count))))
+
diff --git a/2017/d12/star1.rkt b/2017/d12/star1.rkt
new file mode 100644
index 0000000..87bc86c
--- /dev/null
+++ b/2017/d12/star1.rkt
@@ -0,0 +1,2001 @@
+#lang reader "main.rkt" ★ ; 239
+0 <-> 122, 874, 1940
+1 <-> 1099
+2 <-> 743
+3 <-> 594, 1258
+4 <-> 4, 1473
+5 <-> 109, 628, 1133, 1605
+6 <-> 470, 561, 600, 1272, 1634
+7 <-> 7, 1058, 1074, 1136
+8 <-> 879
+9 <-> 9
+10 <-> 10, 1736
+11 <-> 148, 1826
+12 <-> 774, 1394, 1495
+13 <-> 178, 410
+14 <-> 666, 763, 1696
+15 <-> 793, 1446, 1754, 1993
+16 <-> 1477
+17 <-> 1891, 1970
+18 <-> 476, 1095
+19 <-> 19
+20 <-> 581, 1380, 1817, 1877
+21 <-> 746, 1253
+22 <-> 830, 1021
+23 <-> 1115
+24 <-> 89, 1436
+25 <-> 759, 821
+26 <-> 40, 1254
+27 <-> 553, 1137, 1960
+28 <-> 100, 808
+29 <-> 279, 1223, 1591, 1726
+30 <-> 236, 325, 769, 1132
+31 <-> 425, 1377
+32 <-> 611, 1047
+33 <-> 751, 1797, 1828, 1921
+34 <-> 1563, 1681
+35 <-> 428
+36 <-> 265, 1837
+37 <-> 265, 365, 1455
+38 <-> 1600, 1690
+39 <-> 331
+40 <-> 26, 560, 1512
+41 <-> 911, 1991
+42 <-> 835
+43 <-> 680
+44 <-> 1522
+45 <-> 486, 1794
+46 <-> 170, 334, 944, 1169
+47 <-> 1086
+48 <-> 274, 924
+49 <-> 1664
+50 <-> 721
+51 <-> 1885
+52 <-> 1143, 1205
+53 <-> 148, 696
+54 <-> 1637
+55 <-> 936, 1781
+56 <-> 342, 1212
+57 <-> 911
+58 <-> 692, 1456
+59 <-> 59
+60 <-> 463, 570, 1038, 1711
+61 <-> 824, 1008, 1942
+62 <-> 165, 1926
+63 <-> 1689
+64 <-> 64, 321
+65 <-> 98, 116, 1082
+66 <-> 1426, 1497
+67 <-> 502, 951, 1514
+68 <-> 215, 610, 803
+69 <-> 264, 1660
+70 <-> 417, 648, 1142
+71 <-> 1937
+72 <-> 744, 1158
+73 <-> 466
+74 <-> 74, 673
+75 <-> 640, 1874
+76 <-> 575, 708, 1347, 1488
+77 <-> 435, 1648
+78 <-> 412
+79 <-> 347
+80 <-> 807
+81 <-> 176, 394
+82 <-> 366, 928
+83 <-> 737
+84 <-> 84, 1537
+85 <-> 1325
+86 <-> 546
+87 <-> 678, 941, 1229
+88 <-> 1325
+89 <-> 24, 89
+90 <-> 431, 988, 1453
+91 <-> 825, 957, 1249
+92 <-> 937, 1516
+93 <-> 1840
+94 <-> 916, 1445
+95 <-> 1628, 1998
+96 <-> 123
+97 <-> 355
+98 <-> 65
+99 <-> 425, 771, 1050
+100 <-> 28, 100
+101 <-> 337, 1257
+102 <-> 270, 1754
+103 <-> 103, 229
+104 <-> 157, 916
+105 <-> 1705
+106 <-> 1165
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+108 <-> 1082
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+111 <-> 944, 1249
+112 <-> 112, 1056
+113 <-> 1219
+114 <-> 129, 617
+115 <-> 422
+116 <-> 65
+117 <-> 200, 1802
+118 <-> 243, 1507
+119 <-> 732, 1103
+120 <-> 160
+121 <-> 320, 336
+122 <-> 0, 582, 1931
+123 <-> 96, 885, 1126, 1914
+124 <-> 124, 413
+125 <-> 125
+126 <-> 367, 655
+127 <-> 1290
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+129 <-> 114, 1343, 1805
+130 <-> 130, 1415
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+133 <-> 1713
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+135 <-> 1048
+136 <-> 153, 1209
+137 <-> 137, 331
+138 <-> 555, 1350
+139 <-> 1035, 1345
+140 <-> 393, 688
+141 <-> 1037, 1998
+142 <-> 736
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+145 <-> 318, 445, 1471, 1608
+146 <-> 146, 294
+147 <-> 714
+148 <-> 11, 53
+149 <-> 364, 854, 1254
+150 <-> 675, 1090
+151 <-> 189, 1411, 1688
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+153 <-> 136, 1328, 1648
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+160 <-> 120, 859
+161 <-> 984, 1769, 1943
+162 <-> 1098
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+164 <-> 697, 922, 1688
+165 <-> 62, 158, 1452, 1977
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+174 <-> 174, 332
+175 <-> 655, 839
+176 <-> 81, 176, 1264
+177 <-> 177
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+181 <-> 1633, 1783
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+183 <-> 685
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+186 <-> 917, 1541
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+188 <-> 395
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+227 <-> 658
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+229 <-> 103, 1975
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+242 <-> 1127
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+250 <-> 1254
+251 <-> 491, 1129
+252 <-> 623
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+254 <-> 1473
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+256 <-> 1290, 1838
+257 <-> 474, 1708, 1945
+258 <-> 728, 1297
+259 <-> 374, 464, 1637
+260 <-> 168, 1699
+261 <-> 677, 1164
+262 <-> 1507
+263 <-> 564
+264 <-> 69, 264, 912
+265 <-> 36, 37
+266 <-> 1362
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+273 <-> 311, 969
+274 <-> 48, 667
+275 <-> 268, 672, 1687
+276 <-> 1609
+277 <-> 490, 1252
+278 <-> 1236, 1984
+279 <-> 29
+280 <-> 932, 1860
+281 <-> 372, 638, 1311
+282 <-> 1199, 1308
+283 <-> 1938
+284 <-> 315, 1375, 1799
+285 <-> 1377, 1613
+286 <-> 1661
+287 <-> 185, 1248
+288 <-> 409, 1457
+289 <-> 1025
+290 <-> 606, 1486, 1925
+291 <-> 734, 1407
+292 <-> 330
+293 <-> 360, 1231
+294 <-> 146, 1887
+295 <-> 1237, 1733
+296 <-> 132, 296, 621
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+298 <-> 1958
+299 <-> 696
+300 <-> 1300
+301 <-> 203
+302 <-> 1188, 1349
+303 <-> 750, 1701
+304 <-> 304, 503
+305 <-> 402, 630, 636, 1479
+306 <-> 1007, 1350, 1502
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+312 <-> 217, 387, 1357
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+763 <-> 14, 359, 511, 1542
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+1521 <-> 585, 1385
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+1523 <-> 1224, 1339, 1428, 1589
+1524 <-> 731, 1216, 1524
+1525 <-> 582, 1109, 1388
+1526 <-> 594, 799
+1527 <-> 1900, 1906
+1528 <-> 1085
+1529 <-> 1529, 1622
+1530 <-> 134, 1994
+1531 <-> 784, 798, 1122
+1532 <-> 699, 1532
+1533 <-> 1355, 1997
+1534 <-> 874, 1992
+1535 <-> 1777
+1536 <-> 1798
+1537 <-> 84
+1538 <-> 1740
+1539 <-> 1539
+1540 <-> 341
+1541 <-> 186, 351, 906
+1542 <-> 763, 1319
+1543 <-> 437, 1675
+1544 <-> 340, 1544
+1545 <-> 1376, 1484
+1546 <-> 1073, 1987
+1547 <-> 344, 1769
+1548 <-> 1356, 1990
+1549 <-> 214, 1314
+1550 <-> 1391
+1551 <-> 1362, 1929
+1552 <-> 406, 632, 1153, 1183
+1553 <-> 1916
+1554 <-> 1144, 1721, 1984
+1555 <-> 893
+1556 <-> 1451, 1963
+1557 <-> 820
+1558 <-> 1558, 1623
+1559 <-> 777, 1674
+1560 <-> 1560
+1561 <-> 523, 1564
+1562 <-> 205, 1773, 1948, 1985
+1563 <-> 34, 875
+1564 <-> 861, 1561
+1565 <-> 1941
+1566 <-> 1356, 1779
+1567 <-> 544, 1567
+1568 <-> 1106
+1569 <-> 712, 930
+1570 <-> 601
+1571 <-> 1002, 1097
+1572 <-> 1371
+1573 <-> 1573
+1574 <-> 1055, 1942
+1575 <-> 132
+1576 <-> 328
+1577 <-> 241
+1578 <-> 911
+1579 <-> 984
+1580 <-> 427, 1128, 1218
+1581 <-> 486
+1582 <-> 491, 809, 1751, 1842
+1583 <-> 1150
+1584 <-> 1099, 1839
+1585 <-> 1817
+1586 <-> 1103
+1587 <-> 1379
+1588 <-> 744, 1112
+1589 <-> 1523
+1590 <-> 837, 1590
+1591 <-> 29, 1121, 1603
+1592 <-> 1157, 1592
+1593 <-> 575
+1594 <-> 950, 1767
+1595 <-> 339, 1131, 1391, 1482
+1596 <-> 1596
+1597 <-> 1745
+1598 <-> 1036
+1599 <-> 226, 510
+1600 <-> 38
+1601 <-> 485, 1695, 1801
+1602 <-> 205
+1603 <-> 1591
+1604 <-> 1604
+1605 <-> 5, 201, 479
+1606 <-> 313
+1607 <-> 432
+1608 <-> 145, 1906
+1609 <-> 276, 504, 1520
+1610 <-> 1075
+1611 <-> 1508, 1641
+1612 <-> 1110
+1613 <-> 285
+1614 <-> 152
+1615 <-> 351, 759, 1215
+1616 <-> 1087
+1617 <-> 396, 1448
+1618 <-> 1155, 1971
+1619 <-> 672, 961
+1620 <-> 179, 1739
+1621 <-> 1461
+1622 <-> 1529, 1893
+1623 <-> 803, 1558
+1624 <-> 500, 1436
+1625 <-> 682
+1626 <-> 131, 1428
+1627 <-> 314
+1628 <-> 95, 684
+1629 <-> 889, 1629
+1630 <-> 850, 1286
+1631 <-> 947, 1631, 1952
+1632 <-> 386, 1646
+1633 <-> 181
+1634 <-> 6, 1634
+1635 <-> 374, 989
+1636 <-> 687, 1496, 1839
+1637 <-> 54, 259, 739, 1458
+1638 <-> 157, 853
+1639 <-> 1253
+1640 <-> 888, 976, 1679
+1641 <-> 952, 1417, 1611, 1810
+1642 <-> 849, 1285, 1995
+1643 <-> 1774, 1993, 1996
+1644 <-> 516
+1645 <-> 780
+1646 <-> 107, 974, 1632
+1647 <-> 1516
+1648 <-> 77, 153, 794
+1649 <-> 1037
+1650 <-> 1843
+1651 <-> 236
+1652 <-> 825, 1090
+1653 <-> 564
+1654 <-> 1124, 1977
+1655 <-> 1133, 1466
+1656 <-> 154, 357, 557
+1657 <-> 669
+1658 <-> 1670
+1659 <-> 1360, 1840
+1660 <-> 69
+1661 <-> 286, 494, 829, 1152
+1662 <-> 1662, 1663
+1663 <-> 1213, 1412, 1662
+1664 <-> 49, 371, 1200, 1500, 1937
+1665 <-> 733
+1666 <-> 1414
+1667 <-> 329, 365, 1393
+1668 <-> 578, 1934
+1669 <-> 1060, 1935
+1670 <-> 726, 1658
+1671 <-> 863, 1312, 1919
+1672 <-> 255
+1673 <-> 996
+1674 <-> 190, 1559, 1815
+1675 <-> 1479, 1543
+1676 <-> 1165
+1677 <-> 1156
+1678 <-> 853, 1283, 1889
+1679 <-> 1640
+1680 <-> 1055
+1681 <-> 34, 1220
+1682 <-> 1690, 1757
+1683 <-> 1879
+1684 <-> 351, 793
+1685 <-> 504, 865
+1686 <-> 548, 1052, 1686
+1687 <-> 275
+1688 <-> 151, 164, 1435
+1689 <-> 63, 1170, 1172
+1690 <-> 38, 1682
+1691 <-> 391, 411, 789, 851
+1692 <-> 241
+1693 <-> 1445
+1694 <-> 1717
+1695 <-> 1601
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+1697 <-> 978, 1992
+1698 <-> 1997
+1699 <-> 260
+1700 <-> 924
+1701 <-> 215, 303
+1702 <-> 1742
+1703 <-> 519, 1905
+1704 <-> 1025
+1705 <-> 105, 1212
+1706 <-> 727, 834, 1284
+1707 <-> 1707
+1708 <-> 257
+1709 <-> 218
+1710 <-> 1001
+1711 <-> 60, 204
+1712 <-> 1712
+1713 <-> 133, 207, 388
+1714 <-> 746, 953
+1715 <-> 562
+1716 <-> 1716
+1717 <-> 192, 1694
+1718 <-> 988
+1719 <-> 1094
+1720 <-> 815, 1266
+1721 <-> 1554
+1722 <-> 992
+1723 <-> 1723
+1724 <-> 992, 1493, 1745
+1725 <-> 677, 1731
+1726 <-> 29, 1453
+1727 <-> 420, 1858
+1728 <-> 631
+1729 <-> 1126
+1730 <-> 297, 1825
+1731 <-> 1725
+1732 <-> 1732, 1799
+1733 <-> 295
+1734 <-> 131
+1735 <-> 549, 802
+1736 <-> 10, 1757
+1737 <-> 988, 1768
+1738 <-> 972, 1844
+1739 <-> 641, 642, 1620, 1739
+1740 <-> 1538, 1961
+1741 <-> 1935
+1742 <-> 1092, 1702, 1903
+1743 <-> 1845, 1945
+1744 <-> 1335, 1744
+1745 <-> 1597, 1724, 1745
+1746 <-> 1975
+1747 <-> 209, 1122, 1464
+1748 <-> 1047
+1749 <-> 905
+1750 <-> 377, 1996
+1751 <-> 901, 1582
+1752 <-> 1342
+1753 <-> 1974, 1998
+1754 <-> 15, 102
+1755 <-> 782, 1821
+1756 <-> 1756
+1757 <-> 241, 1682, 1736, 1959
+1758 <-> 897
+1759 <-> 1871
+1760 <-> 576
+1761 <-> 733, 1761
+1762 <-> 615, 1882
+1763 <-> 1825
+1764 <-> 320
+1765 <-> 349, 721
+1766 <-> 1781
+1767 <-> 1594, 1767
+1768 <-> 1737
+1769 <-> 161, 385, 1547
+1770 <-> 1046
+1771 <-> 842, 1930
+1772 <-> 1246
+1773 <-> 1562
+1774 <-> 1643
+1775 <-> 1005
+1776 <-> 475, 483, 1146, 1822, 1928
+1777 <-> 1535, 1777
+1778 <-> 529, 1857
+1779 <-> 512, 1566
+1780 <-> 1780
+1781 <-> 55, 389, 1766
+1782 <-> 1249
+1783 <-> 181, 1094, 1933
+1784 <-> 616, 768
+1785 <-> 369, 546
+1786 <-> 493
+1787 <-> 307, 1787
+1788 <-> 1440, 1972
+1789 <-> 318
+1790 <-> 844, 1790
+1791 <-> 487, 899
+1792 <-> 189, 382, 1384
+1793 <-> 966, 1392
+1794 <-> 45, 862
+1795 <-> 1944
+1796 <-> 1064
+1797 <-> 33
+1798 <-> 1216, 1536
+1799 <-> 284, 1732, 1924
+1800 <-> 221, 914
+1801 <-> 1601
+1802 <-> 117, 583, 785
+1803 <-> 995
+1804 <-> 355, 784
+1805 <-> 129
+1806 <-> 1238, 1853
+1807 <-> 1261
+1808 <-> 461
+1809 <-> 180, 316, 602, 1186
+1810 <-> 1641
+1811 <-> 1353
+1812 <-> 159, 458, 559, 1833
+1813 <-> 1880
+1814 <-> 336, 793
+1815 <-> 399, 1674
+1816 <-> 1816
+1817 <-> 20, 1585
+1818 <-> 1017
+1819 <-> 800
+1820 <-> 824, 1121, 1898
+1821 <-> 1755
+1822 <-> 1776
+1823 <-> 1087
+1824 <-> 234, 1017
+1825 <-> 478, 1730, 1763
+1826 <-> 11, 384, 608, 1087, 1884
+1827 <-> 326, 629
+1828 <-> 33, 818
+1829 <-> 630
+1830 <-> 986
+1831 <-> 522, 983, 1107
+1832 <-> 943, 1317, 1860
+1833 <-> 369, 1812
+1834 <-> 1301
+1835 <-> 375
+1836 <-> 394, 652
+1837 <-> 36, 484
+1838 <-> 256, 1912
+1839 <-> 1584, 1636
+1840 <-> 93, 1356, 1659
+1841 <-> 1219
+1842 <-> 1582, 1892
+1843 <-> 805, 1119, 1650
+1844 <-> 208, 594, 1738
+1845 <-> 681, 1346, 1743
+1846 <-> 1846
+1847 <-> 1301, 1847
+1848 <-> 1279
+1849 <-> 1341
+1850 <-> 851, 1850
+1851 <-> 520, 963
+1852 <-> 524, 663, 991, 1936
+1853 <-> 568, 1806
+1854 <-> 405
+1855 <-> 736
+1856 <-> 587, 1380
+1857 <-> 1472, 1778, 1893
+1858 <-> 414, 1727, 1896, 1983
+1859 <-> 1859
+1860 <-> 280, 1832, 1895
+1861 <-> 1313
+1862 <-> 245
+1863 <-> 674, 1863
+1864 <-> 1245
+1865 <-> 884, 1090
+1866 <-> 418, 461
+1867 <-> 686, 1066
+1868 <-> 354, 755, 1909
+1869 <-> 238, 1454
+1870 <-> 713, 1371
+1871 <-> 667, 1354, 1759
+1872 <-> 253, 614, 1054
+1873 <-> 268
+1874 <-> 75, 1927
+1875 <-> 680, 959, 1269
+1876 <-> 628
+1877 <-> 20, 638
+1878 <-> 344, 1278, 1341, 1890
+1879 <-> 1683, 1879
+1880 <-> 199, 592, 1813
+1881 <-> 1182
+1882 <-> 196, 1294, 1762
+1883 <-> 822, 823
+1884 <-> 962, 1157, 1826
+1885 <-> 51, 1923
+1886 <-> 1142
+1887 <-> 294, 879
+1888 <-> 514, 791
+1889 <-> 1678
+1890 <-> 1481, 1878
+1891 <-> 17, 858
+1892 <-> 362, 1842
+1893 <-> 485, 648, 1174, 1622, 1857
+1894 <-> 890
+1895 <-> 1860
+1896 <-> 1858
+1897 <-> 1897
+1898 <-> 1820
+1899 <-> 916
+1900 <-> 1527
+1901 <-> 324, 790, 1361, 1901
+1902 <-> 594
+1903 <-> 650, 1437, 1742, 1903, 1968
+1904 <-> 317
+1905 <-> 679, 1162, 1703
+1906 <-> 1527, 1608, 1932
+1907 <-> 1907
+1908 <-> 1908
+1909 <-> 1868
+1910 <-> 870, 1296
+1911 <-> 223, 239, 402, 877
+1912 <-> 1167, 1838
+1913 <-> 1105
+1914 <-> 123, 166
+1915 <-> 1270, 1280
+1916 <-> 1351, 1553
+1917 <-> 1146
+1918 <-> 1042
+1919 <-> 1671
+1920 <-> 460
+1921 <-> 33, 1241
+1922 <-> 1067
+1923 <-> 1319, 1475, 1885
+1924 <-> 1799
+1925 <-> 290, 981
+1926 <-> 62, 460
+1927 <-> 1167, 1874
+1928 <-> 550, 1776
+1929 <-> 1551
+1930 <-> 1771
+1931 <-> 122, 386
+1932 <-> 1906
+1933 <-> 841, 1783
+1934 <-> 1227, 1668
+1935 <-> 1669, 1741
+1936 <-> 1519, 1852
+1937 <-> 71, 1664
+1938 <-> 283, 456
+1939 <-> 1103
+1940 <-> 0
+1941 <-> 222, 499, 1565, 1941
+1942 <-> 61, 311, 1574
+1943 <-> 161
+1944 <-> 193, 958, 1397, 1795
+1945 <-> 257, 881, 1743
+1946 <-> 1367
+1947 <-> 1154, 1190, 1408
+1948 <-> 1562, 1948
+1949 <-> 1188
+1950 <-> 348
+1951 <-> 178, 835, 1161
+1952 <-> 1631
+1953 <-> 1050
+1954 <-> 977, 1299, 1501
+1955 <-> 804
+1956 <-> 1956
+1957 <-> 323, 657
+1958 <-> 298, 953
+1959 <-> 1757
+1960 <-> 27, 1078
+1961 <-> 387, 861, 1148, 1740
+1962 <-> 732, 1962
+1963 <-> 1556
+1964 <-> 1964
+1965 <-> 1242
+1966 <-> 1203
+1967 <-> 974, 1403
+1968 <-> 1903
+1969 <-> 664
+1970 <-> 17, 509, 1970
+1971 <-> 1097, 1618
+1972 <-> 155, 1366, 1788
+1973 <-> 547, 990, 1263
+1974 <-> 184, 1753
+1975 <-> 229, 1746
+1976 <-> 899, 1110
+1977 <-> 165, 1654
+1978 <-> 969
+1979 <-> 696, 717
+1980 <-> 1111, 1188, 1504
+1981 <-> 595
+1982 <-> 1982
+1983 <-> 380, 1858
+1984 <-> 278, 1554
+1985 <-> 1562
+1986 <-> 1278
+1987 <-> 1334, 1546
+1988 <-> 404
+1989 <-> 588, 1016
+1990 <-> 682, 712, 1548
+1991 <-> 41, 895
+1992 <-> 1116, 1534, 1697
+1993 <-> 15, 1207, 1643
+1994 <-> 1530
+1995 <-> 1642
+1996 <-> 167, 1181, 1643, 1750
+1997 <-> 1533, 1698
+1998 <-> 95, 141, 1753
+1999 <-> 792
\ No newline at end of file
diff --git a/2017/d12/star2.rkt b/2017/d12/star2.rkt
new file mode 100644
index 0000000..4da74d1
--- /dev/null
+++ b/2017/d12/star2.rkt
@@ -0,0 +1,2001 @@
+#lang reader "main.rkt" ★★ ; 215
+0 <-> 122, 874, 1940
+1 <-> 1099
+2 <-> 743
+3 <-> 594, 1258
+4 <-> 4, 1473
+5 <-> 109, 628, 1133, 1605
+6 <-> 470, 561, 600, 1272, 1634
+7 <-> 7, 1058, 1074, 1136
+8 <-> 879
+9 <-> 9
+10 <-> 10, 1736
+11 <-> 148, 1826
+12 <-> 774, 1394, 1495
+13 <-> 178, 410
+14 <-> 666, 763, 1696
+15 <-> 793, 1446, 1754, 1993
+16 <-> 1477
+17 <-> 1891, 1970
+18 <-> 476, 1095
+19 <-> 19
+20 <-> 581, 1380, 1817, 1877
+21 <-> 746, 1253
+22 <-> 830, 1021
+23 <-> 1115
+24 <-> 89, 1436
+25 <-> 759, 821
+26 <-> 40, 1254
+27 <-> 553, 1137, 1960
+28 <-> 100, 808
+29 <-> 279, 1223, 1591, 1726
+30 <-> 236, 325, 769, 1132
+31 <-> 425, 1377
+32 <-> 611, 1047
+33 <-> 751, 1797, 1828, 1921
+34 <-> 1563, 1681
+35 <-> 428
+36 <-> 265, 1837
+37 <-> 265, 365, 1455
+38 <-> 1600, 1690
+39 <-> 331
+40 <-> 26, 560, 1512
+41 <-> 911, 1991
+42 <-> 835
+43 <-> 680
+44 <-> 1522
+45 <-> 486, 1794
+46 <-> 170, 334, 944, 1169
+47 <-> 1086
+48 <-> 274, 924
+49 <-> 1664
+50 <-> 721
+51 <-> 1885
+52 <-> 1143, 1205
+53 <-> 148, 696
+54 <-> 1637
+55 <-> 936, 1781
+56 <-> 342, 1212
+57 <-> 911
+58 <-> 692, 1456
+59 <-> 59
+60 <-> 463, 570, 1038, 1711
+61 <-> 824, 1008, 1942
+62 <-> 165, 1926
+63 <-> 1689
+64 <-> 64, 321
+65 <-> 98, 116, 1082
+66 <-> 1426, 1497
+67 <-> 502, 951, 1514
+68 <-> 215, 610, 803
+69 <-> 264, 1660
+70 <-> 417, 648, 1142
+71 <-> 1937
+72 <-> 744, 1158
+73 <-> 466
+74 <-> 74, 673
+75 <-> 640, 1874
+76 <-> 575, 708, 1347, 1488
+77 <-> 435, 1648
+78 <-> 412
+79 <-> 347
+80 <-> 807
+81 <-> 176, 394
+82 <-> 366, 928
+83 <-> 737
+84 <-> 84, 1537
+85 <-> 1325
+86 <-> 546
+87 <-> 678, 941, 1229
+88 <-> 1325
+89 <-> 24, 89
+90 <-> 431, 988, 1453
+91 <-> 825, 957, 1249
+92 <-> 937, 1516
+93 <-> 1840
+94 <-> 916, 1445
+95 <-> 1628, 1998
+96 <-> 123
+97 <-> 355
+98 <-> 65
+99 <-> 425, 771, 1050
+100 <-> 28, 100
+101 <-> 337, 1257
+102 <-> 270, 1754
+103 <-> 103, 229
+104 <-> 157, 916
+105 <-> 1705
+106 <-> 1165
+107 <-> 1646
+108 <-> 1082
+109 <-> 5
+110 <-> 485, 1185
+111 <-> 944, 1249
+112 <-> 112, 1056
+113 <-> 1219
+114 <-> 129, 617
+115 <-> 422
+116 <-> 65
+117 <-> 200, 1802
+118 <-> 243, 1507
+119 <-> 732, 1103
+120 <-> 160
+121 <-> 320, 336
+122 <-> 0, 582, 1931
+123 <-> 96, 885, 1126, 1914
+124 <-> 124, 413
+125 <-> 125
+126 <-> 367, 655
+127 <-> 1290
+128 <-> 1085
+129 <-> 114, 1343, 1805
+130 <-> 130, 1415
+131 <-> 1626, 1734
+132 <-> 296, 573, 1575
+133 <-> 1713
+134 <-> 1243, 1530
+135 <-> 1048
+136 <-> 153, 1209
+137 <-> 137, 331
+138 <-> 555, 1350
+139 <-> 1035, 1345
+140 <-> 393, 688
+141 <-> 1037, 1998
+142 <-> 736
+143 <-> 716, 1362
+144 <-> 1319
+145 <-> 318, 445, 1471, 1608
+146 <-> 146, 294
+147 <-> 714
+148 <-> 11, 53
+149 <-> 364, 854, 1254
+150 <-> 675, 1090
+151 <-> 189, 1411, 1688
+152 <-> 683, 1614
+153 <-> 136, 1328, 1648
+154 <-> 584, 1656
+155 <-> 1972
+156 <-> 1351
+157 <-> 104, 1638
+158 <-> 165
+159 <-> 444, 1812
+160 <-> 120, 859
+161 <-> 984, 1769, 1943
+162 <-> 1098
+163 <-> 618
+164 <-> 697, 922, 1688
+165 <-> 62, 158, 1452, 1977
+166 <-> 166, 1914
+167 <-> 1996
+168 <-> 260, 843, 1057, 1433
+169 <-> 406, 736, 924
+170 <-> 46
+171 <-> 173, 833, 1104, 1149
+172 <-> 1429
+173 <-> 171, 1423
+174 <-> 174, 332
+175 <-> 655, 839
+176 <-> 81, 176, 1264
+177 <-> 177
+178 <-> 13, 1162, 1182, 1951
+179 <-> 842, 1620
+180 <-> 1294, 1442, 1809
+181 <-> 1633, 1783
+182 <-> 182, 456
+183 <-> 685
+184 <-> 760, 1974
+185 <-> 287, 775
+186 <-> 917, 1541
+187 <-> 412, 1119
+188 <-> 395
+189 <-> 151, 1370, 1792
+190 <-> 1255, 1674
+191 <-> 764, 1010
+192 <-> 192, 607, 1717
+193 <-> 1001, 1944
+194 <-> 625
+195 <-> 623
+196 <-> 1882
+197 <-> 1275
+198 <-> 1069
+199 <-> 1138, 1880
+200 <-> 117
+201 <-> 1605
+202 <-> 1041, 1044
+203 <-> 207, 301, 815, 1311
+204 <-> 204, 1711
+205 <-> 1298, 1562, 1602
+206 <-> 228
+207 <-> 203, 1480, 1713
+208 <-> 786, 1844
+209 <-> 1291, 1351, 1747
+210 <-> 1320
+211 <-> 587, 1340
+212 <-> 587, 676
+213 <-> 886
+214 <-> 1549
+215 <-> 68, 1115, 1371, 1701
+216 <-> 1127
+217 <-> 312
+218 <-> 466, 1072, 1709
+219 <-> 527
+220 <-> 793
+221 <-> 1314, 1800
+222 <-> 1941
+223 <-> 1911
+224 <-> 224, 528
+225 <-> 1030, 1084
+226 <-> 569, 1599
+227 <-> 658
+228 <-> 206, 579, 800, 1381
+229 <-> 103, 1975
+230 <-> 1068
+231 <-> 937
+232 <-> 428
+233 <-> 969, 1258
+234 <-> 1824
+235 <-> 1218
+236 <-> 30, 1410, 1470, 1651
+237 <-> 815
+238 <-> 477, 1518, 1869
+239 <-> 985, 1911
+240 <-> 809, 1047
+241 <-> 1379, 1577, 1692, 1757
+242 <-> 1127
+243 <-> 118
+244 <-> 440, 747, 771, 1051
+245 <-> 644, 725, 1332, 1862
+246 <-> 395, 1168
+247 <-> 1118
+248 <-> 1462
+249 <-> 737
+250 <-> 1254
+251 <-> 491, 1129
+252 <-> 623
+253 <-> 1046, 1872
+254 <-> 1473
+255 <-> 1220, 1672
+256 <-> 1290, 1838
+257 <-> 474, 1708, 1945
+258 <-> 728, 1297
+259 <-> 374, 464, 1637
+260 <-> 168, 1699
+261 <-> 677, 1164
+262 <-> 1507
+263 <-> 564
+264 <-> 69, 264, 912
+265 <-> 36, 37
+266 <-> 1362
+267 <-> 267
+268 <-> 275, 1873
+269 <-> 449, 766
+270 <-> 102
+271 <-> 1139, 1156
+272 <-> 369, 584
+273 <-> 311, 969
+274 <-> 48, 667
+275 <-> 268, 672, 1687
+276 <-> 1609
+277 <-> 490, 1252
+278 <-> 1236, 1984
+279 <-> 29
+280 <-> 932, 1860
+281 <-> 372, 638, 1311
+282 <-> 1199, 1308
+283 <-> 1938
+284 <-> 315, 1375, 1799
+285 <-> 1377, 1613
+286 <-> 1661
+287 <-> 185, 1248
+288 <-> 409, 1457
+289 <-> 1025
+290 <-> 606, 1486, 1925
+291 <-> 734, 1407
+292 <-> 330
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+1843 <-> 805, 1119, 1650
+1844 <-> 208, 594, 1738
+1845 <-> 681, 1346, 1743
+1846 <-> 1846
+1847 <-> 1301, 1847
+1848 <-> 1279
+1849 <-> 1341
+1850 <-> 851, 1850
+1851 <-> 520, 963
+1852 <-> 524, 663, 991, 1936
+1853 <-> 568, 1806
+1854 <-> 405
+1855 <-> 736
+1856 <-> 587, 1380
+1857 <-> 1472, 1778, 1893
+1858 <-> 414, 1727, 1896, 1983
+1859 <-> 1859
+1860 <-> 280, 1832, 1895
+1861 <-> 1313
+1862 <-> 245
+1863 <-> 674, 1863
+1864 <-> 1245
+1865 <-> 884, 1090
+1866 <-> 418, 461
+1867 <-> 686, 1066
+1868 <-> 354, 755, 1909
+1869 <-> 238, 1454
+1870 <-> 713, 1371
+1871 <-> 667, 1354, 1759
+1872 <-> 253, 614, 1054
+1873 <-> 268
+1874 <-> 75, 1927
+1875 <-> 680, 959, 1269
+1876 <-> 628
+1877 <-> 20, 638
+1878 <-> 344, 1278, 1341, 1890
+1879 <-> 1683, 1879
+1880 <-> 199, 592, 1813
+1881 <-> 1182
+1882 <-> 196, 1294, 1762
+1883 <-> 822, 823
+1884 <-> 962, 1157, 1826
+1885 <-> 51, 1923
+1886 <-> 1142
+1887 <-> 294, 879
+1888 <-> 514, 791
+1889 <-> 1678
+1890 <-> 1481, 1878
+1891 <-> 17, 858
+1892 <-> 362, 1842
+1893 <-> 485, 648, 1174, 1622, 1857
+1894 <-> 890
+1895 <-> 1860
+1896 <-> 1858
+1897 <-> 1897
+1898 <-> 1820
+1899 <-> 916
+1900 <-> 1527
+1901 <-> 324, 790, 1361, 1901
+1902 <-> 594
+1903 <-> 650, 1437, 1742, 1903, 1968
+1904 <-> 317
+1905 <-> 679, 1162, 1703
+1906 <-> 1527, 1608, 1932
+1907 <-> 1907
+1908 <-> 1908
+1909 <-> 1868
+1910 <-> 870, 1296
+1911 <-> 223, 239, 402, 877
+1912 <-> 1167, 1838
+1913 <-> 1105
+1914 <-> 123, 166
+1915 <-> 1270, 1280
+1916 <-> 1351, 1553
+1917 <-> 1146
+1918 <-> 1042
+1919 <-> 1671
+1920 <-> 460
+1921 <-> 33, 1241
+1922 <-> 1067
+1923 <-> 1319, 1475, 1885
+1924 <-> 1799
+1925 <-> 290, 981
+1926 <-> 62, 460
+1927 <-> 1167, 1874
+1928 <-> 550, 1776
+1929 <-> 1551
+1930 <-> 1771
+1931 <-> 122, 386
+1932 <-> 1906
+1933 <-> 841, 1783
+1934 <-> 1227, 1668
+1935 <-> 1669, 1741
+1936 <-> 1519, 1852
+1937 <-> 71, 1664
+1938 <-> 283, 456
+1939 <-> 1103
+1940 <-> 0
+1941 <-> 222, 499, 1565, 1941
+1942 <-> 61, 311, 1574
+1943 <-> 161
+1944 <-> 193, 958, 1397, 1795
+1945 <-> 257, 881, 1743
+1946 <-> 1367
+1947 <-> 1154, 1190, 1408
+1948 <-> 1562, 1948
+1949 <-> 1188
+1950 <-> 348
+1951 <-> 178, 835, 1161
+1952 <-> 1631
+1953 <-> 1050
+1954 <-> 977, 1299, 1501
+1955 <-> 804
+1956 <-> 1956
+1957 <-> 323, 657
+1958 <-> 298, 953
+1959 <-> 1757
+1960 <-> 27, 1078
+1961 <-> 387, 861, 1148, 1740
+1962 <-> 732, 1962
+1963 <-> 1556
+1964 <-> 1964
+1965 <-> 1242
+1966 <-> 1203
+1967 <-> 974, 1403
+1968 <-> 1903
+1969 <-> 664
+1970 <-> 17, 509, 1970
+1971 <-> 1097, 1618
+1972 <-> 155, 1366, 1788
+1973 <-> 547, 990, 1263
+1974 <-> 184, 1753
+1975 <-> 229, 1746
+1976 <-> 899, 1110
+1977 <-> 165, 1654
+1978 <-> 969
+1979 <-> 696, 717
+1980 <-> 1111, 1188, 1504
+1981 <-> 595
+1982 <-> 1982
+1983 <-> 380, 1858
+1984 <-> 278, 1554
+1985 <-> 1562
+1986 <-> 1278
+1987 <-> 1334, 1546
+1988 <-> 404
+1989 <-> 588, 1016
+1990 <-> 682, 712, 1548
+1991 <-> 41, 895
+1992 <-> 1116, 1534, 1697
+1993 <-> 15, 1207, 1643
+1994 <-> 1530
+1995 <-> 1642
+1996 <-> 167, 1181, 1643, 1750
+1997 <-> 1533, 1698
+1998 <-> 95, 141, 1753
+1999 <-> 792
\ No newline at end of file
diff --git a/2017/d12/test1.rkt b/2017/d12/test1.rkt
new file mode 100644
index 0000000..ad80f3e
--- /dev/null
+++ b/2017/d12/test1.rkt
@@ -0,0 +1,8 @@
+#lang reader "main.rkt" ★ ; 6
+0 <-> 2
+1 <-> 1
+2 <-> 0, 3, 4
+3 <-> 2, 4
+4 <-> 2, 3, 6
+5 <-> 6
+6 <-> 4, 5
\ No newline at end of file
diff --git a/2017/d12/test2.rkt b/2017/d12/test2.rkt
new file mode 100644
index 0000000..09e7cb2
--- /dev/null
+++ b/2017/d12/test2.rkt
@@ -0,0 +1,8 @@
+#lang reader "main.rkt" ★★ ; 2
+0 <-> 2
+1 <-> 1
+2 <-> 0, 3, 4
+3 <-> 2, 4
+4 <-> 2, 3, 6
+5 <-> 6
+6 <-> 4, 5
\ No newline at end of file