Combining Texts

You have chosen 'The Logic of Boundaryless Concepts' by Ian Rumfitt, 'The Spirit of the Laws (rev. 1757)' by Baron de Montesquieu and 'The Foundations of Empirical Knowledge' by A.J. Ayer

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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