Combining Texts

You have chosen 'From Stimulus to Science' by Willard Quine, 'Course of Positive Philosophy' by Auguste Comte and 'On the General Idea of Proof Theory' by Dag Prawitz

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories