Combining Texts

You have chosen 'The Facts of Causation' by D.H. Mellor, 'Remarks on the forces of inorganic Nature' by J.R. Mayer and 'The Problem of Counterfactual Conditionals' by Nelson Goodman

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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