You have chosen 'Reply to 'Rorarius' 2nd ed' by Gottfried Leibniz, 'Words without Objects' by Henry Laycock and 'Frege's Distinction of Sense and Reference' by Michael Dummett
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |