You have chosen 'Centring' by Anon (Cent), 'Epistemology: contemporary introduction' by Robert Audi and 'Grundgesetze der Arithmetik 1 (Basic Laws)' by Gottlob Frege
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |