Combining Texts

You have chosen 'The Scientific Image' by Bas C. van Fraassen, 'Il Saggiatore ('The Assayer')' by Galileo Galilei and 'The Approach to Metaphysics' by Charles Sanders Peirce

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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