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This paper was written white the author was an Andrew Mellon Postdoctoral Fellow in the Department of Philosophy, University of Pittsburgh. He wishes to thank Lennart Åqvist for his constructive comments.
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Segerberg, K. Two-dimensional modal logic. J Philos Logic 2, 77–96 (1973). https://doi.org/10.1007/BF02115610
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DOI: https://doi.org/10.1007/BF02115610