Combining Texts

You have chosen 'Exigency to Exist in Essences' by Gottfried Leibniz, 'Axioms for the Part Relation' by Nicholas Rescher and 'Can Mechanisms Replace Laws of Nature?' by Bert Leuridan

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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