Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Elements of Mathematical Logic' by Jan Lukasiewicz and 'The Principles of Human Knowledge' by George Berkeley

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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