| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adv] [prep] a | 701 |
|
| 2 | refer [prep] [prep] a | 187 |
|
| 3 | refer [prep] [adv] [prep] | 98 |
|
| 4 | refer [adv] [prep] a | 27 |
|
| 5 | refer [prep] [adv] a | 6 |
|
