4 steps wm1137wm1137 signature 13→43 rule {{{1, 1, 2}} -> {{2, 2, 2}, {2, 1, 2}, {1, 2, 3}, {3, 3, 1}}} {{{1, 1, 2}} -> {{2, 2, 2}, {2, 1, 2}, {1, 2, 3}, {3, 3, 1}}}