Combining Texts

You have chosen 'Why Constitution is not Identity' by Lynne Rudder Baker, 'Letters to Wagner' by Gottfried Leibniz and 'Building Blocks of Mathematical Logic' by Moses Schnfinkel

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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