Why does (a, b)(b, c) = (a, b, c)(adsbygoogle = window.adsbygoogle || []).push({});

and why does (a, b)(c, d) = (a, b, c)(b, c, d). I don't understand how we get that c goes to b, since there is no d in the first cycle.

Colleen

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# Another Permutation Question

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