Combining Texts

You have chosen 'General Facts,Phys Necessity, and Metaph of Time' by Peter Forrest, 'The Fragmentation of Reason' by Stephen P. Stich and 'The Inference to the Best Explanation' by Gilbert Harman

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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