You have chosen 'On the Ultimate Origination of Things' by Gottfried Leibniz, 'On the Conservation of Force' by Hermann von Helmholtz and 'Boole calculus and the Concept script' by Gottlob Frege
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |