Combining Texts

You have chosen 'Presidential Address of Am. Math. Soc' by Oswald Veblen, 'Answer to 'What is Enlightenment?'' by Immanuel Kant and 'Collins Dictionary of Philosophy' by Godfrey Vesey

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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