Combining Texts

You have chosen 'Wittgenstein's 'Philosophical Investigations'' by Norman Malcolm, 'On boundary numbers and domains of sets' by Ernst Zermelo and 'Plato on Parts and Wholes' by Verity Harte

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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