| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] problem [is] [adj] [noun] | 27 |
|
| 2 | main [noun] [is] [adj] [noun] | 25 |
|
| 3 | main [noun sg] [is] [adj] [noun] | 23 |
|
| 4 | main problem [is] [adj] [noun] | 5 |
|
| 5 | main problem [be] [adj] [noun] | 5 |
|
