| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [vb pp] [prep] a [noun] | 4468 |
|
| 2 | [verb] [vb pp] [prep] [art] problem | 43 |
|
| 3 | [verb] [vb pp] [prep] [art] problem | 43 |
|
| 4 | [verb] [verb] [prep] a problem | 14 |
|
| 5 | [verb] [vb pp] [prep] a problem | 5 |
|
