Combining Texts

You have chosen 'A Slim Book about Narrow Content' by Gabriel M.A. Segal, 'Paper of December 1676' by Gottfried Leibniz and 'Homeostasis, Species and Higher Taxa' by Richard Boyd

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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