| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] difficult | 732 |
|
| 2 | it is [adv] and | 71 |
|
| 3 | is [adv] difficult and | 38 |
|
| 4 | it [adv] difficult and | 9 |
|
| 5 | it is difficult and | 8 |
|
