Combining Texts

You have chosen 'On Motion' by Gottfried Leibniz, 'How Things Might Have Been' by Penelope Mackie and 'Of Organum or Ars Magna of Thinking' 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