You have chosen 'Abstract of 'The Fourfold Root'' by Arthur Schopenhauer, 'Set Theory and the Continuum Hypothesis' by Paul J. Cohen and 'On Medical Experience' by Galen
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |