Combining Texts

You have chosen 'Critique of the Gotha Program' by Karl Marx, 'Remarks on the Foundations of Mathematics' by Ludwig Wittgenstein and 'Punctual and segmentive Hopi verbs' by Benjamin Lee Whorf

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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