
50 steps
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23→43
rule

{{{1, 2, 2}, {3, 4, 5}} -> {{6, 7, 7}, {6, 2, 1}, {7, 5, 3}, {8, 7, 9}}}
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{{{1, 2, 2}, {3, 4, 5}} -> {{6, 7, 7}, {6, 2, 1}, {7, 5, 3}, {8, 7, 9}}}