For checking equivalence of any two word morphisms, restricted on a subset (language), it suffices to do this for a finite subset of the language, the so-called finite test set. A way of effectively obtaining a finite test set for a special class of languages, the so-called iterated morphisms, is presented here together with an explicit upper bound for its size. The method can be extended to free metabelian groups, and to certain other metabeliahfgroups.
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