Combining Texts

You have chosen 'Letters to Antoine Arnauld' by Gottfried Leibniz, 'On the Ultimate Origination of Things' by Gottfried Leibniz and 'The Roots of Reference' by Willard Quine

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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