You have chosen 'Counterpart theory and Quant. Modal Logic' by David Lewis, 'Letters to Samuel Masson' by Gottfried Leibniz and 'Frege's Theory of Numbers' by Charles Parsons
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |