Combining Texts

You have chosen 'Letters to Wolff' by Gottfried Leibniz, 'The Universe as We Find It' by John Heil and 'On the Moral and Legal State of Abortion' by Mary Anne Warren

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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