| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [prep] [adj] [noun] | 172 |
|
| 2 | been used [prep] [adj] [noun] | 112 |
|
| 3 | had been used [prep] [noun] | 41 |
|
| 4 | had been used [prep] [adj] | 15 |
|
