| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult it is for | 20 |
|
| 2 | [adv] difficult it [is] for | 20 |
|
| 3 | how difficult it [is] for | 17 |
|
| 4 | how difficult it [is] for | 17 |
|
| 5 | [Wh adv] difficult it [is] for | 17 |
|
