You have chosen 'Defeasibility Theory' by Thomas Grundmann, 'Reply to Hellman' by Willard Quine and 'Gentzen's Analysis of First-Order Proofs' by Dag Prawitz
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |