Combining Texts

You have chosen 'On the Principles of Indiscernibles' by Gottfried Leibniz, 'New Foundations for Mathematical Logic' by Willard Quine and 'Identity, Ostension, and Hypostasis' 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