Rule:Reversible

@RULE reversible

https://conwaylife.com/forums/viewtopic.php?p=11005#p11024

@TREE

num_states=4 num_neighbors=8 num_nodes=32 1 0 2 1 3 1 1 2 0 3 1 1 3 0 2 2 0 0 0 0 2 0 1 0 1 2 1 0 1 0 2 0 2 0 2 2 2 0 2 0 3 3 3 3 3 3 4 5 4 5 3 5 3 5 3 3 3 6 3 6 3 6 7 6 7 3 7 3 7 3 4 8 8 8 8 4 9 10 9 10 4 10 8 10 8 4 11 12 11 12 4 12 13 12 13 5 14 14 14 14 5 15 16 15 16 5 17 18 17 18 6 19 20 19 20 6 20 21 20 21 6 21 19 21 19 6 19 19 19 19 7 22 23 22 23 7 23 24 23 24 7 24 25 24 25 8 26 27 26 27 8 27 28 27 28 9 29 30 29 30