Combining Texts

You have chosen 'The Essential Child' by Susan A. Gelman, 'Homeostasis, Species and Higher Taxa' by Richard Boyd and 'Of the First Principles of Government' by David Hume

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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