You have chosen 'Elucidation of some points in E.Schröder' by Gottlob Frege, 'The Principles of Mathematics' by Bertrand Russell and 'From Stimulus to Science' by Willard Quine
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |