Solution to 11.
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[entire statement] |
| T | T | F | F | T | F | T | T | T |
| T | F | F | T | F | F | F | F | T |
| F | T | T | F | F | F | F | F | T |
| F | F | T | T | F | T | T | T | T |
The statement is a tautology, as can be seen by the fact that there are only Ts in its truth column.