Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Geometrical Method and Metaphysics' by Gottfried Leibniz and 'The Mind and the Soul' by Jenny Teichmann

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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