Combining Texts

You have chosen 'Letters to a German Princess' by Leonhard Euler, 'Symbolic Logic (with Langford)' by C.I. Lewis and 'Meditatio de principio individui' by Gottfried Leibniz

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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