Combining Texts

You have chosen 'The Decline of the West' by Oswald Spengler, 'Methodological Reflections on Current Linguistic Theory' by Willard Quine and 'Explanation and Reference' by Hilary Putnam

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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