| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [adv] [prep] [noun] | 10919 |
|
| 2 | [adv] difficult [prep] [noun] | 245 |
|
| 3 | [adv] difficult [prep] [noun] | 232 |
|
| 4 | [adv] [adv] difficult [prep] | 140 |
|
| 5 | [adv] [adv] difficult [noun] | 71 |
|
