You have chosen 'Regressive Method for Premises in Mathematics' by Bertrand Russell, 'Modal Logic within Counterfactual Logic' by Timothy Williamson and 'Geometrical Method and Metaphysics' by Gottfried Leibniz
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |