You have chosen 'Investigations in the Foundations of Set Theory I' by Ernst Zermelo, 'Nature and Observability of Causal Relations' by Curt Ducasse and 'Principles of Nature and Grace based on Reason' by Gottfried Leibniz
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |