Combining Texts

You have chosen 'A Discourse on Method' by René Descartes, 'Dialogue on human freedom and origin of evil' by Gottfried Leibniz and 'Logic and Epistemology of Causal Relations' by G.H. von Wright

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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