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Partially supported by SSHRC grant 410-78-0084. Section II of this paper was presented to the 9th International Symposium on Multiple-Valued Logic under the title ‘Multiple-valued consistency’.
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Schotch, P.K., Jennings, R.E. Inference and necessity. J Philos Logic 9, 327–340 (1980). https://doi.org/10.1007/BF00248398
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DOI: https://doi.org/10.1007/BF00248398