You have chosen 'Function and Concept' by Gottlob Frege, 'Oxford Commentary on Sentences' by John Duns Scotus and 'Regressive Method for Premises in Mathematics' by Bertrand Russell
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |