You have chosen 'Elucidation of some points in E.Schröder' by Gottlob Frege, 'Reply to 'Rorarius' 2nd ed' by Gottfried Leibniz and 'Letters to Burcher De Volder' by Gottfried Leibniz
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |