50 steps
wm5189wm5189
signature
23→43
rule
{{{1, 2, 2}, {3, 4, 5}} -> {{6, 3, 3}, {1, 6, 7}, {8, 5, 1}, {4, 8, 9}}}
{{{1, 2, 2}, {3, 4, 5}} -> {{6, 3, 3}, {1, 6, 7}, {8, 5, 1}, {4, 8, 9}}}
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