You have chosen 'Principle of Life and Plastic Natures' by Gottfried Leibniz, 'The Life of Reason' by George Santayana and 'A Tour through Mathematical Logic' by Robert S. Wolf
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |