| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] [art] problem is [that] | 25 |
|
| 2 | [noun] [prep] [art] problem is [that] | 25 |
|
| 3 | [noun] of [art] problem is [that] | 24 |
|
| 4 | [noun] of [art] problem is [that] | 24 |
|
