| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been referred [prep] the | 28 |
|
| 2 | have been referred to the | 26 |
|
| 3 | had been referred [prep] the | 11 |
|
| 4 | has been referred [prep] the | 9 |
|
| 5 | have been referred [prep] the | 6 |
|
