Combining Texts

You have chosen 'A Realistic Theory of Categories' by Roderick Chisholm, 'Believing the Axioms I' by Penelope Maddy and 'Abortion and the Doctrine of Double Effect' by Philippa Foot

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