| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] the problem [be] the | 19 |
|
| 2 | [prep] the problem [be] the | 19 |
|
| 3 | [prep] the problem be the | 19 |
|
| 4 | of the problem [be] the | 13 |
|
| 5 | of the problem [be] the | 13 |
|
| 6 | [prep] the problem [is] the | 12 |
|
| 7 | [prep] the problem is the | 12 |
|
| 8 | [prep] the problem [was/were] the | 7 |
|
