| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | how difficult it [is] [verb] the | 5 |
|
| 2 | how difficult it is [verb] the | 5 |
|
| 3 | how difficult it [is] [verb] the | 5 |
|
| 4 | how difficult it [is] [to-vb] the | 5 |
|
