Combining Texts

You have chosen 'The Bhagavad Gita' by Anon (Bhag), 'Letters to Burcher De Volder' by Gottfried Leibniz and 'On the Nature of the Gods ('De natura deorum')' by M. Tullius Cicero

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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