You have chosen 'The Journals of Kierkegaard' by Søren Kierkegaard, 'A Completeness Theorem in Modal Logic' by Saul A. Kripke and 'Regressive Method for Premises in Mathematics' by Bertrand Russell
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| A. | A Priori Knowledge | |
| B. | Perception | |
| C. | Rationalism | |
| D. | Empiricism | |
| E. | Direct Knowledge |