Combining Texts

You have chosen 'The Spirit of the Laws (rev. 1757)' by Baron de Montesquieu, 'What is the Basis of Moral Obligation?' by H.A. Prichard and 'Metaphysical Foundations of Mathematics' 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