Rule:Revfour

@RULE Revfour

https://conwaylife.com/forums/viewtopic.php?p=11297#p11302

Reversible second order rule from B4/S4 Conserves "energy"

@TREE

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

@COLORS

0 255 255 255 1 255 0 0 2 127 255 0 3 0 0 255