| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] [det] [prep] [art] | 2681 |
|
| 2 | [det] [prep] [art] problems | 376 |
|
| 3 | [to-vb] [prep] [art] problems | 107 |
|
| 4 | [to-vb] [det] [art] problems | 5 |
|
