Combining Texts

You have chosen 'On Motion' by Gottfried Leibniz, 'First-order Logic, 2nd-order, Completeness' by Marcus Rossberg and 'The Second Coming' by Franco 'Bifo' Berardi

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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