Combining Texts

You have chosen 'Principles of Philosophy' by René Descartes, 'The Logic of Boundaryless Concepts' by Ian Rumfitt and 'Which Logic is the Right Logic?' by Leslie H. Tharp

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All the ideas for Modality, or select a subheading:
      A. Necessity
      B. Possibility
      C. Sources of Modality
      D. Knowledge of Modality
      E. Possible worlds