You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'Fourfold Root of Princ of Sufficient Reason' by Arthur Schopenhauer and 'On the spiritual perfection of life' by Thomas Aquinas
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |