| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [conj] [prep] | 1316 |
|
| 2 | problem [is] [conj] | 613 |
|
| 3 | problem [is] [prep] | 97 |
|
| 4 | problem [conj] [prep] | 82 |
|
