| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] [prep] these | 812 |
|
| 2 | [prep] these problem | 317 |
|
| 3 | [to-vb] [prep] problem | 79 |
|
| 4 | [to-vb] these problem | 77 |
|
