You have chosen 'Notes on John Wilkins' by Gottfried Leibniz, 'Symbolic Logic (with Langford)' by C.I. Lewis and 'Difficulties of Transfinite Numbers and Types' by Bertrand Russell
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |