Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Defining 'Intrinsic' (with Rae Langton)' by David Lewis and 'Regressive Method for Premises in Mathematics' by Bertrand Russell

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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