Combining Texts

You have chosen 'From an Ontological Point of View' by John Heil, 'Explanations in reply to Mr Bradley' by Bertrand Russell and 'Armstrong on combinatorial possibility' 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