Combining Texts

You have chosen 'Super Epistolam Pauli Apostoli' by Thomas Aquinas, 'The Universe as We Find It' by John Heil and 'Symbolic Logic (with Langford)' by C.I. Lewis

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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