Combining Texts

You have chosen 'On the Concept of Number' by David Hilbert, 'Facts and Propositions' by Frank P. Ramsey and 'On the Notion of Cause' by Bertrand Russell

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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