Combining Texts

You have chosen 'From an Ontological Point of View' by John Heil, 'An Axiomatization of Set Theory' by John von Neumann and 'Introduction to Philosophical Papers II' by David Lewis

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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