| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | the problem of [adv] the | 10 |
|
| 2 | [art] problem of [Wh adv] the | 10 |
|
| 3 | [art] problem of how the | 7 |
|
| 4 | [art] problem of how the | 7 |
|
