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Part of this work was done while the author was supported by NSF Grant MCS 77-03719.
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Bergman, G.M. Hyperidentities of groups and semigroups. Aeq. Math. 23, 50–65 (1981). https://doi.org/10.1007/BF02188011
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DOI: https://doi.org/10.1007/BF02188011