Combining Texts

You have chosen 'The Artworld' by Arthur C. Danto, 'Dialogue on human freedom and origin of evil' by Gottfried Leibniz and 'Identity over Time' by Andr Gallois

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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