Combining Texts

You have chosen 'works' by Charles Sanders Peirce, 'The Origin of the Species' by Charles Darwin and 'What do powers do when they are not manifested?' by Stathis Psillos

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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