You have chosen 'Letters to Varignon' by Gottfried Leibniz, 'The Nature of Existence vol.2' by J.M.E. McTaggart and 'The Concept of Truth for Formalized Languages' by Alfred Tarski
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |