| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a problem [prep] | 383 |
|
| 2 | [verb] [vb pp] a problem | 115 |
|
| 3 | [verb] [vb pp] problem [prep] | 70 |
|
| 4 | [vb pp] a problem [prep] | 68 |
|
| 5 | [verb] [vb pp] a [prep] | 11 |
|
