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Communicated by Boris M. Schein
This research has been supported by the Natural Sciences and Engineering Research Council of Canada under Grants A7877 and A7350 respectively.
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Guo, Y.Q., Reis, C.M. & Thierrin, G. Relatively f-disjunctive languages. Semigroup Forum 37, 289–299 (1988). https://doi.org/10.1007/BF02573141
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DOI: https://doi.org/10.1007/BF02573141