Combining Texts

You have chosen 'Building Blocks of Mathematical Logic' by Moses Schönfinkel, 'Philosophy' by Karl Jaspers and 'The Logic of Boundaryless Concepts' by Ian Rumfitt

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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