Jana Hadravová

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Let w be an equality word of two nonperiodic binary morphisms g, h : {a, b}∗ → ∆∗. Suppose that no overflow occurs twice in w and that w contains at least 9 occurrences of a and at least 9 occurrences of b. Then either w = (ab)a, or w = ab with gcd(i, j) = 1, up to the exchange of letters a and b.
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