You have chosen 'The Roots of Reference' by Willard Quine, 'Rules for the Direction of the Mind' by Ren Descartes 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 |