| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been used [prep] [noun] | 308 |
|
| 2 | used [prep] an [noun] | 282 |
|
| 3 | been [prep] an [noun] | 62 |
|
| 4 | been used [prep] an | 23 |
|
