Combining Texts

You have chosen 'Perception' by Howard Robinson, 'Remarks on axiomatised set theory' by Thoralf Skolem and 'On the Nature of the Gods ('De natura deorum')' by M. Tullius Cicero

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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