Combining Texts

You have chosen 'Lectures on the History of Philosophy' by Georg W.F.Hegel, 'Identity and Necessity' by Saul A. Kripke and 'The Principles of Chemistry' by Dmitri Mendeleev

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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