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We wish to thank the National Science Foundation for partial support under grant GP-9564 and GP-6826 during the preparation of this paper.
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Bleicher, M.N., Schneider, H. & Wilson, R.L. Permanence of identities on algebras. Algebra Univ. 3, 72–93 (1973). https://doi.org/10.1007/BF02945106
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DOI: https://doi.org/10.1007/BF02945106