You have chosen 'A Combinatorial Theory of Possibility' by David M. Armstrong, 'Abstract of 'The Fourfold Root'' by Arthur Schopenhauer and 'Penguin Dictionary of Philosophy' by Thomas Mautner
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |