Combining Texts

You have chosen 'Queries to the 'Opticks'' by Isaac Newton, 'Remarks on the Foundations of Mathematics' by Ludwig Wittgenstein and 'Among the Dead Cities' by A.C. Grayling

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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