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4 steps
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13→43
rule
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{{{1, 2, 1}} -> {{1, 3, 1}, {3, 1, 3}, {4, 2, 1}, {5, 4, 5}}}
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{{{1, 2, 1}} -> {{1, 3, 1}, {3, 1, 3}, {4, 2, 1}, {5, 4, 5}}}