You have chosen 'Counterpart theory and Quant. Modal Logic' by David Lewis, 'The Theory of Logical Types' by Bertrand Russell and 'To be is to be the value of a variable..' by George Boolos
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| A. | Justification Problems | |
| B. | Internal Justification | |
| C. | External Justification | |
| D. | Scepticism | |
| E. | Relativism |