4 steps wm4547wm4547 signature 13→43 rule {{{1, 1, 2}} -> {{1, 1, 3}, {3, 3, 2}, {4, 1, 1}, {5, 5, 4}}} {{{1, 1, 2}} -> {{1, 1, 3}, {3, 3, 2}, {4, 1, 1}, {5, 5, 4}}}