Combining Texts

You have chosen 'Through the Looking Glass' by Lewis Carroll (C.Dodgson), 'The Advancement of Learning' by Francis Bacon and 'On the Principles of Indiscernibles' by Gottfried Leibniz

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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