Combining Texts

You have chosen 'Sweet Dreams' by Daniel C. Dennett, 'Review of Chihara 'Struct. Accnt of Maths'' by John P. Burgess 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