Combining Texts

You have chosen 'The Character of Physical Law' by Richard P. Feynman, 'The Unimportance of Identity' by Derek Parfit and 'Letter to the Editor about Bayle' 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