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I would like to thank Ingmar Pörn for valuable comments on an earlier version of this paper.
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Hansson, S.O. A note on the deontic system DL of Jones and Pörn. Synthese 80, 427–428 (1989). https://doi.org/10.1007/BF00869584
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DOI: https://doi.org/10.1007/BF00869584