You have chosen 'Reply to Foucher' by Gottfried Leibniz, 'On Copernicanism and Relativity of Motion' by Gottfried Leibniz and 'Proof of an External World' by G.E. Moore
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |