| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | of [verb] [noun] is | 316 |
|
| 2 | problem of [verb] [noun] | 210 |
|
| 3 | problem of [noun] is | 72 |
|
| 4 | problem [verb] [noun] is | 10 |
|
