Combining Texts

You have chosen 'reports' by Buddha (Siddhartha Gautama), 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell and 'Metaphysical conseqs of principle of reason' by Gottfried Leibniz

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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