Combining Texts

You have chosen 'A Puzzle Concerning Matter and Form' by Kit Fine, 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz and 'Reply to Fifth Objections' by Ren Descartes

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All the ideas for Thought, or select a subheading:
      A. Modes of Thought
      B. Mechanics of Thought
      C. Content
      D. Concepts
      E. Abstraction