Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Defining 'Intrinsic' (with Rae Langton)' by David Lewis and 'The Meditations (To Himself)' by Marcus Aurelius

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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