Combining Texts

You have chosen 'Writing the Book of the World' by Theodore Sider, 'The Sign of Four' by Arthur Conan Doyle and 'Against Elections' by David van Reybrouck

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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