You have chosen 'A Completeness Theorem in Modal Logic' by Saul A. Kripke, 'Notes on Comments by Fardella' by Gottfried Leibniz and 'Croce and Collingwood' by Gary Kemp
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |