You have chosen 'Frege's Concept of Numbers as Objects' by Crispin Wright, 'Pref to new 'Materialist Theory'' by David M. Armstrong and 'Launching Points to the Realm of the Mind' by Porphyry
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |