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Communicated by G. Lallement
This research has been supported by Grant S174A3 of the NSERC of Canada
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Reis, C.M. F-disjunctive congruences and a generalization of monoids with length. Semigroup Forum 41, 291–306 (1990). https://doi.org/10.1007/BF02573397
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DOI: https://doi.org/10.1007/BF02573397