| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | refer to [art] | 3376 |
|
| 2 | [vb mod] refer to | 356 |
|
| 3 | [vb mod] to [art] | 85 |
|
| 4 | [vb mod] refer [art] | 29 |
|
