Combining Texts

You have chosen 'Reply to 'Rorarius' 2nd ed' by Gottfried Leibniz, 'Positivism and Realism' by Moritz Schlick and 'Elucidation of some points in E.Schrder' by Gottlob Frege

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      A. Basis of Science
      B. Scientific Theories
      C. Induction
      D. Explanation