Combining Texts

You have chosen 'The Big Book of Concepts' by Gregory L. Murphy, 'Letters to Mersenne' by Ren Descartes and 'Writing the Book of the World' by Theodore Sider

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All the ideas for Social Practice, or select a subheading:
      A. Freedoms
      B. Equalities
      C. Rights
      D. Justice
      E. Policies
      F. Life Issues