You have chosen 'Geometrical Method and Metaphysics' by Gottfried Leibniz, 'Boole calculus and the Concept script' by Gottlob Frege and 'The Sign of Four' by Arthur Conan Doyle
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |