Combining Texts

You have chosen 'Sources of Knowledge of Mathematics' by Gottlob Frege, 'Constitutional Code I' by Jeremy Bentham and 'From an Ontological Point of View' by John Heil

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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