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Both of these authors gratefully acknowledge the National Science and Engineering Research Council of Canada who supported this research.
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Pöschel, R., Sapir, M.V., Sauer, N.W. et al. Identities in full transformation semigroups. Algebra Universalis 31, 580–588 (1994). https://doi.org/10.1007/BF01236507
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DOI: https://doi.org/10.1007/BF01236507