Solution to 6.
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[entire statement] |
| T | T | T | F | F | F | T | T | F |
| T | T | F | F | T | F | T | T | T |
| T | F | T | T | F | T | F | T | F |
| T | F | F | T | T | T | F | F | F |
| F | T | T | F | F | F | T | T | F |
| F | T | F | F | T | F | T | T | T |
| F | F | T | T | F | F | T | T | F |
| F | F | F | T | T | F | T | T | T |
The statement is a contingency, as can be seen by the fact that there are both Ts and Fs in its truth column.