Combining Texts

You have chosen 'On the True Doctrine (Against Christians)' by Celsus, 'Intro to 'Modality and Tense'' by Kit Fine and 'Real Natures and Familiar Objects' by Crawford L. Elder

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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