You have chosen 'Letters to Jourdain' by Gottlob Frege, 'Intro to 'Provenance of Pure Reason'' by William W. Tait and 'Set Theory and its Logic' by Willard Quine
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |