17 steps
wm6572wm6572
signature
22→42
rule
{{{1, 2}, {2, 3}} -> {{4, 3}, {4, 3}, {4, 2}, {3, 1}}}
{{{1, 2}, {2, 3}} -> {{4, 3}, {4, 3}, {4, 2}, {3, 1}}}
make editable copy
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