| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | used [prep] a [noun] | 1904 |
|
| 2 | been [prep] a [noun] | 765 |
|
| 3 | been used [prep] [noun] | 308 |
|
| 4 | been used [prep] a | 195 |
|
