| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [that] it [is] difficult [to-vb] [noun pl] | 10 |
|
| 2 | that it [is] difficult [verb] [noun pl] | 10 |
|
| 3 | [that] it is difficult [verb] [noun pl] | 9 |
|
