| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | and it [is] difficult [to-vb] | 98 |
|
| 2 | it [is] difficult [adv] [to-vb] | 64 |
|
| 3 | and it [is] difficult [adv] | 9 |
|
| 4 | and it [is] [adv] [to-vb] | 5 |
|
