Combining Texts

You have chosen 'On Duties ('De Officiis')' by M. Tullius Cicero, 'What We Owe to Each Other' by Thomas M. Scanlon 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