Combining Texts

You have chosen 'works' by Sigmund Freud, 'The Protestant Ethic and the Spirit of Capitalism' by Max Weber and 'The Logic of Scientific Discovery' by Karl Popper

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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