| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] avoided at [adj] [noun] | 9 |
|
| 2 | must [be] avoided at [adj] cost | 9 |
|
| 3 | must [be] avoided at [adj] costs | 8 |
|
| 4 | must [be] avoided at [adj] [noun pl] | 8 |
|
