| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been used [prep] [noun] | 308 |
|
| 2 | not been [prep] [noun] | 284 |
|
| 3 | not used [prep] [noun] | 54 |
|
| 4 | not been used [prep] | 44 |
|
