Combining Texts

You have chosen 'Writing the Book of the World' by Theodore Sider, 'Librium de interpretatione editio secunda' by Boethius and 'Sets, Aggregates and Numbers' by Palle Yourgrau

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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