| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | refer to [prep] [art] | 881 |
|
| 2 | to [prep] [art] [num ord] | 68 |
|
| 3 | refer [prep] [art] [num ord] | 34 |
|
| 4 | refer to [art] [num ord] | 30 |
|
