You have chosen 'Elucidation of some points in E.Schröder' by Gottlob Frege, 'Elements of Intuitionism' by Michael Dummett and 'The Sign of Four' by Arthur Conan Doyle
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |