Combining Texts

You have chosen 'A Mathematical Introduction to Logic (2nd)' by Herbert B. Enderton, 'Reference and Modality' by Willard Quine and 'The Reasons of Love' by Harry G. Frankfurt

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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