Combining Texts

You have chosen 'The Character of Physical Law' by Richard P. Feynman, 'Counterfactual Dependence and Time's Arrow' by David Lewis and 'Reply to Fourth Objections' by Ren Descartes

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories