Combining Texts

You have chosen 'Precepts for Advancing Science and Arts' by Gottfried Leibniz, 'Chomsky on himself' by Noam Chomsky and 'The Evolution of Logic' by William D. Hart

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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