You have chosen 'Contrib to Critique of Hegel's Phil of Right' by Karl Marx, 'Empiricism, Semantics and Ontology' by Rudolph Carnap and 'Preface to 'De Revolutionibus'' by Andreas Osiander
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| A. | Basis of Science | |
| B. | Scientific Theories | |
| C. | Induction | |
| D. | Explanation |