Combining Texts

You have chosen 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz, 'Moral Philosophy meets social psychology' by Gilbert Harman and 'On Divination ('De divinatione')' by M. Tullius Cicero

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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