| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | refer [prep] [art] | 449 |
|
| 2 | refer to [art] | 446 |
|
| 3 | refer to [art] | 446 |
|
| 4 | refer [prep] the | 389 |
|
| 5 | refer [prep] a | 56 |
|
