You have chosen 'Abstract of 'The Fourfold Root'' by Arthur Schopenhauer, 'Inexpressible Properties and Propositions' by Thomas Hofweber and 'Preface to 'Principles of Philosophy'' by Ren Descartes
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |