Combining Texts

You have chosen 'A World of States of Affairs' by David M. Armstrong, 'Slaughterhouse Five' by Kurt Vonnegut and 'Consciousness, Philosophy and Mathematics' by Luitzen E.J. Brouwer

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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