Combining Texts

You have chosen 'On boundary numbers and domains of sets' by Ernst Zermelo, 'Women of Trachis' by Sophocles and 'On the Necessity of Origin' by Colin McGinn

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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