| Share | Phrase |
|---|
| 29.50% | unsuitable for use |
| 25.83% | unsuitable [effectiveness] make |
| 13.31% | unsuitable [effectiveness] render |
| 10.47% | unsuitable [effectiveness] system |
| 9.05% | unsuitable [effectiveness] condition |
| 7.69% | unsuitable for operation |
| 4.12% | generally unsuitable |