Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Tarski on Truth and Logical Consequence' by John Etchemendy and 'Of the First Principles of Government' by David Hume

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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