You have chosen 'Nature and Observability of Causal Relations' by Curt Ducasse, 'Treatise on Quantity' by Peter John Olivi and 'The Vocation of Man' by Johann Fichte
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |