| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [prep] a [noun] | 53584 |
|
| 2 | [vb pp] [prep] [art] problem | 361 |
|
| 3 | [vb pp] [prep] [art] problem | 361 |
|
| 4 | [verb] [prep] a problem | 165 |
|
| 5 | [vb pp] [prep] a problem | 85 |
|
