Combining Texts

You have chosen 'On Liberty' by John Stuart Mill, 'The Tragic Sense of Life' by Miguel de Unamuno and 'Counting and the Natural Numbers' by Jeffrey H. Sicha

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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