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Communicated by L. N. Shevrin
In future we shall consider only abstract classes.
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Kuspanov, U.K. On the classes of orderable semigroups in varieties. Semigroup Forum 16, 117–131 (1978). https://doi.org/10.1007/BF02194621
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DOI: https://doi.org/10.1007/BF02194621