Combining Texts

You have chosen 'Intro to Principles of Morals and Legislation' by Jeremy Bentham, 'Tusculan Disputations' by M. Tullius Cicero and 'On the Algebra of Logic' by Charles Sanders Peirce

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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