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7 steps
wm1598wm1598
signature
22→42
rule
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{{{1, 2}, {3, 2}} -> {{4, 2}, {2, 4}, {4, 1}, {3, 4}}}
{{{1, 2}, {3, 2}} -> {{4, 2}, {2, 4}, {4, 1}, {3, 4}}}