Combining Texts

You have chosen 'The Intentionality of Sensation' by G.E.M. Anscombe, 'The Facts of Causation' by D.H. Mellor and 'Pref to new 'Materialist Theory'' by David M. Armstrong

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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