| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been used [prep] [noun] | 69 |
|
| 2 | have been [prep] this [noun] | 34 |
|
| 3 | been used [prep] this [noun] | 12 |
|
| 4 | have been used [prep] this | 5 |
|
