| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult [coord] | 300 |
|
| 2 | [adv] difficult to control | 32 |
|
| 3 | [adv] to control [coord] | 7 |
|
| 4 | difficult to control [coord] | 7 |
|
