Combining Texts

You have chosen 'Letters to a German Princess' by Leonhard Euler, 'Precis of 'Limits of Abstraction'' by Kit Fine and 'Occasions of Identity' by Andr Gallois

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All the ideas for Science, or select a subheading:
      A. Basis of Science
      B. Scientific Theories
      C. Induction
      D. Explanation