Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Inference to the Best Explanation (2nd)' by Peter Lipton and 'Daodejing (Tao Te Ching)' by Laozi (Lao Tzu)

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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