Combining Texts

You have chosen 'Identity over Time' by André Gallois, 'Remarks on the Foundations of Mathematics' by Ludwig Wittgenstein and 'Real Essence' by Jan-Erik Jones

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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