Combining Texts

You have chosen 'In Metaphysics' by John Duns Scotus, 'On Probability and Induction' by Hans Reichenbach and 'Of Organum or Ars Magna of Thinking' 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