| Summary: | <div class="page" title="Page 1"><div class="layoutArea"><div class="column"><p><span>The Parikh matrix mapping was introduced by Mateescu <em>et al</em>. in 2001 as a canonical generalization of the classical Parikh mapping. The injectivity problem of Parikh matrices, even for ternary case, has withstanded numerous attempts over a decade by various researchers, among whom is Serbanuta. Certain </span><em>M</em><span>-ambiguous words are crucial in Serbanuta's findings about the number of </span><em>M</em><span>-unambiguous prints. We will show that these words are in fact strongly </span><em>M</em><span>-ambiguous, thus suggesting a possible extension of Serbanuta’s work to the context of strong </span><span>M</span><span>-equivalence. In addition, initial results pertaining to a related conjecture by Serbanuta will be presented.</span></p></div></div></div>
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