You have chosen 'Reply to 'Rorarius' 2nd ed' by Gottfried Leibniz, 'Proof of an External World' by G.E. Moore and 'Summa totius logicae' by William of Ockham
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |