Combining Texts

You have chosen 'Tusculan Disputations' by M. Tullius Cicero, 'On the Algebra of Logic' by Charles Sanders Peirce and 'Perceptual experience has conceptual content' by Bill Brewer

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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