Combining Texts

You have chosen 'To be is to be the value of a variable..' by George Boolos, 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz and 'Aboutness' by Stephen Yablo

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All the ideas for Action, or select a subheading:
      A. Definition of Action
      B. Preliminaries of Action
      C. Motives for Action