Combining Texts

You have chosen 'Introduction to Mathematical Logic' by Michal Walicki, 'The Sign of Four' by Arthur Conan Doyle and 'Remarks on the definition and nature of mathematics' by Haskell B. Curry

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All the ideas for Objects, or select a subheading:
      A. Existence of Objects
      B. Unity of Objects
      C. Structure of Objects
      D. Essence of Objects
      E. Objects over Time
      F. Identity among Objects