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For R.W.
I am grateful to Victoria University of Wellington for supporting this work with a Postdoctoral Fellowship in 1976 and 1977.
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Epstein, R.L. Relatedness and implication. Philosophical Studies 36, 137–173 (1979). https://doi.org/10.1007/BF00354267
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DOI: https://doi.org/10.1007/BF00354267