Combining Texts

You have chosen 'The Establishment of Scientific Semantics' by Alfred Tarski, 'What is an Idea?' by Gottfried Leibniz and 'The Runabout Inference Ticket' by Arthur N. Prior

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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