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6 steps
wm1714wm1714
signature
23→43
rule
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{{{1, 2, 3}, {4, 5, 6}} -> {{7, 7, 1}, {1, 2, 4}, {3, 7, 2}, {7, 8, 9}}}
{{{1, 2, 3}, {4, 5, 6}} -> {{7, 7, 1}, {1, 2, 4}, {3, 7, 2}, {7, 8, 9}}}