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The authors severally acknowledge support from the National Science Foundation and the Bowling Green State University Faculty Research Committee.
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Baldwin, J.T., Blass, A.R., Glass, A.M.W. et al. A ‘natural’ theory without a prime model. Algebra Univ. 3, 152–155 (1973). https://doi.org/10.1007/BF02945115
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DOI: https://doi.org/10.1007/BF02945115