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This work was supported by a Cottrell College Science Grant from the Research Corporation. The first named author was an undergraduate participant.
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Landolt, W.J., Whaley, T.P. Relatively free implicative semi-lattices. Algebra Universalis 4, 166–184 (1974). https://doi.org/10.1007/BF02485721
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DOI: https://doi.org/10.1007/BF02485721