Combining Texts

You have chosen 'The Character of Physical Law' by Richard P. Feynman, 'Of Organum or Ars Magna of Thinking' by Gottfried Leibniz and 'Rearrangement of Particles' by David Lewis

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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