Combining Texts

You have chosen 'On the Principles of Indiscernibles' by Gottfried Leibniz, 'Probability and Logic of Rational Belief' by Henry E. Kyburg Jr and 'Analyzing Modality' by Michael Jubien

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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