| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] it be difficult for | 20 |
|
| 2 | [coord] it be difficult for | 20 |
|
| 3 | [coord] it is difficult for | 15 |
|
| 4 | and it be difficult for | 15 |
|
| 5 | but it be difficult for | 5 |
|
| 6 | [coord] it was difficult for | 5 |
|
