Combining Texts

You have chosen 'On 'Generation and Corruption'' by Giles of Orleans, 'Some Models for Implicature' by H. Paul Grice and 'Reply to Sixth 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