| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] and it is [verb] | 275 |
|
| 2 | [noun] it is difficult [verb] | 109 |
|
| 3 | and it is difficult [verb] | 85 |
|
| 4 | [noun] and it is difficult | 43 |
|
