Combining Texts

You have chosen 'Two Problems of Epistemology' by Karl Popper, 'Could There Be Unicorns?' by Michael Dummett and 'Identity in Substances and True Propositions' by Gottfried Leibniz

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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