Combining Texts

You have chosen 'What is so bad about Contradictions?' by Graham Priest, 'Rules for the Direction of the Mind' by Ren Descartes and 'What do powers do when they are not manifested?' by Stathis Psillos

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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