You have chosen 'Elements of Mathematical Logic' by Jan Lukasiewicz, 'New Foundations for Mathematical Logic' by Willard Quine and 'The Doctrine of Necessity Examined' by Charles Sanders Peirce
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |