Combining Texts

You have chosen 'Reason, Emotions and Good Life' by John Cottingham, 'On Plural Reference and Set Theory' by Helen Cartwright 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