Combining Texts

You have chosen 'On the Principles of Indiscernibles' by Gottfried Leibniz, 'Intro to 'Rationality in Greek Thought'' by Michael Frede and 'Methodological Reflections on Current Linguistic Theory' by Willard Quine

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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