You have chosen 'Nature and Observability of Causal Relations' by Curt Ducasse, 'The Structure of Appearance' by Nelson Goodman and 'Elements of Mathematical Logic' by Jan Lukasiewicz
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |