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This paper has benefitted from discussions with many people. I am particularly indebted to Dorothy Grover and Arthur Fine for valuable criticism and ingenious counter-examples.
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Chandler, M. The logic of ‘unless’. Philosophical Studies 41, 383–405 (1982). https://doi.org/10.1007/BF00353887
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DOI: https://doi.org/10.1007/BF00353887