Combining Texts

You have chosen 'On the Moral and Legal State of Abortion' by Mary Anne Warren, 'The Evolution of Logic' by William D. Hart and 'Letters to Fardella' by Gottfried Leibniz

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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