You have chosen 'Mathematical Logic (revised)' by Willard Quine, 'The Nature of Universals and Propositions' by G.F. Stout and 'Fourfold Root of Princ of Sufficient Reason' by Arthur Schopenhauer
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |