Combining Texts

You have chosen 'works' by Ernst Zermelo, 'Launching Points to the Realm of the Mind' by Porphyry and 'Wittgenstein on Rules and Private Language' by Saul A. Kripke

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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