| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] had been used for | 5 |
|
| 2 | [conj] had [be] used for | 5 |
|
| 3 | [conj] had [been] used for | 5 |
|
| 4 | [conj] had be used for | 5 |
|
