Combining Texts

You have chosen 'Letters to Edward Stillingfleet' by John Locke, 'This is Political Philosophy' by Tuckness,A/Wolf,C and 'Intro to 2nd ed of Principia Mathematica' 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