Combining Texts

You have chosen 'Intro to Positive Philosophy' by Auguste Comte, 'Human Flourishing, Ethics and Liberty' by Gilbert Harman and 'Primitive Thisness and Primitive Identity' by Robert Merrihew Adams

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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