Combining Texts

You have chosen 'Folk Psychology' by Paul M. Churchland, 'The Spirit of the Laws (rev. 1757)' by Baron de Montesquieu and 'Presidential Address of Am. Math. Soc' by Oswald Veblen

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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