Combining Texts

You have chosen 'The Value of Science' by Henri Poincaré, 'Epistemology: contemporary introduction' by Robert Audi and 'Does Ontology Rest on a Mistake?' by Stephen Yablo

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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