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The second author is grateful for the support of the Alexander von Humboldt Stiftung.
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Bajusz, T., McNulty, G. & Szendrei, Á. Lyndon's groupoid isnot inherently nonfinitely based. Algebra Universalis 27, 254–260 (1990). https://doi.org/10.1007/BF01182458
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DOI: https://doi.org/10.1007/BF01182458