You have chosen 'Investigations in the Foundations of Set Theory I' by Ernst Zermelo, 'Without Immediate Justification' by Michael Williams and 'Letters to Russell' by Ludwig Wittgenstein
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |