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Expletives in languages and middle units in semigroups

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Communicated by G. Lallement

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Tully, E.J. Expletives in languages and middle units in semigroups. Semigroup Forum 38, 77–84 (1989). https://doi.org/10.1007/BF02573219

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  • DOI: https://doi.org/10.1007/BF02573219

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