Combining Texts

You have chosen 'Subjectivist's Guide to Objective Chance' by David Lewis, 'The Concept of Logical Consequence' by Alfred Tarski and 'Elucidation of some points in E.Schrder' by Gottlob Frege

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories