| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] problem [is] | 959 |
|
| 2 | real [noun] [is] | 629 |
|
| 3 | [adj] problem [is] | 530 |
|
| 4 | real problem [be] | 76 |
|
| 5 | real problem [is] | 52 |
|
