Combining Texts

You have chosen 'Truth-makers' by Mulligan/Simons/Smith, 'Philosophical Logic: Intro to Advanced Topics' by Engelbretsen,G/Sayward,C and 'Identity and Reference' by Michael Lockwood

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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