You have chosen 'Letters to Wagner' by Gottfried Leibniz, 'Introduction to Zermelo's 1930 paper' by Michael Hallett and 'Nature and Observability of Causal Relations' by Curt Ducasse
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |