| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | and it is [adv] [prep] | 168 |
|
| 2 | it is [adv] difficult [prep] | 111 |
|
| 3 | and it is [adv] difficult | 56 |
|
| 4 | and it is difficult [prep] | 17 |
|
