Combining Texts

You have chosen 'New System and Explanation of New System' by Gottfried Leibniz, 'Why the Universe Exists' by New Scientist writers and 'The Establishment of Scientific Semantics' by Alfred Tarski

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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