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    \$\begingroup\$ -1, challenge contains no reference to flags \$\endgroup\$ Commented Jul 9, 2015 at 3:13
  • \$\begingroup\$ @Sp3000 Is the arrangement in the image in a particular order? (I assume for the challenge the ordering isn't important, but I'm dying of curiosity about the image. Particularly, if these were used as seeds in an L-System for a Hilbert Space Curve, is there a natural encoding for the set?) \$\endgroup\$ Commented Jul 12, 2015 at 22:40
  • \$\begingroup\$ @luserdroog Well, Sp made the image, best to ask him. \$\endgroup\$ Commented Jul 12, 2015 at 22:42
  • \$\begingroup\$ @luserdroog If you number the cells 1 to 9, they should be in lexicographical order, e.g. the first is 123654789 \$\endgroup\$ Commented Jul 14, 2015 at 15:40
  • \$\begingroup\$ @luserdroog (That is, choose the lexicographically-earlier representative of each pair of directed paths, and then sort those 20 representatives lexicographically.) \$\endgroup\$ Commented Jul 15, 2015 at 0:24