Combining Texts

You have chosen 'Through the Looking Glass' by Lewis Carroll (C.Dodgson), 'On the Question of Absolute Undecidability' by Peter Koellner and 'Launching Points to the Realm of the Mind' by Porphyry

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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