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I am indebted to many people for help on earlier drafts, including William Bechtel, William Lycan, John Martin, and W. E. Morris, as well as other colleagues that took the time and trouble to discuss it with me. This work was supported by grants from the Taft Committee and the Faculty Fellowship Committee at the University of Cincinnati.
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Richardson, R.C. Modality third grade. Philosophia 12, 345–356 (1983). https://doi.org/10.1007/BF02380913
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DOI: https://doi.org/10.1007/BF02380913