| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been used by | 58 |
|
| 2 | had been used by | 34 |
|
| 3 | have been used by | 24 |
|
| 4 | have been used by | 20 |
|
| 5 | to have been used by | 9 |
|
