Combining Texts

You have chosen 'The Inference to the Best Explanation' by Gilbert Harman, 'Principles of Philosophy' by Ren Descartes and 'Critique of the Gotha Program' by Karl Marx

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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