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This research was partially supported by NSF grant no. DMS-9204481. The author would like to thank the referee for several helpful suggestions.
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Freese, R. Alan Day's early work: congruence identities. Algebra Universalis 34, 4–23 (1995). https://doi.org/10.1007/BF01200487
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DOI: https://doi.org/10.1007/BF01200487