| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [adv] difficult [to-vb] | 748 |
|
| 2 | which it [is] difficult [to-vb] | 22 |
|
| 3 | which [is] [adv] difficult [to-vb] | 19 |
|
| 4 | which it [is] [adv] difficult | 11 |
|
