You have chosen '' by , 'Symbolic Logic (with Langford)' by C.I. Lewis and 'Il Saggiatore ('The Assayer')' by Galileo Galilei
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |