34 steps
wm3967wm3967
signature
23→43
rule
{{{1, 2, 1}, {3, 4, 5}} -> {{6, 7, 6}, {8, 1, 7}, {1, 8, 5}, {6, 9, 2}}}
{{{1, 2, 1}, {3, 4, 5}} -> {{6, 7, 6}, {8, 1, 7}, {1, 8, 5}, {6, 9, 2}}}
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