| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [verb] [verb] a | 18283 |
|
| 2 | [noun] [verb] a problem | 199 |
|
| 3 | [verb] [verb] a problem | 197 |
|
| 4 | [noun] [verb] [verb] problem | 97 |
|
