Combining Texts

You have chosen 'Two Problems of Epistemology' by Karl Popper, 'The Law of Peoples' by John Rawls and 'Intro to 2nd ed of Principia Mathematica' by Bertrand Russell

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All the ideas for Formal Logic, or select a subheading:
      A. Syllogistic Logic
      B. Propositional Logic PL
      C. Predicate Calculus PC
      D. Modal Logic ML
      E. Nonclassical Logics
      F. Set Theory ST
      G. Formal Mereology