| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it was difficult [prep] [noun pl] [to-vb] | 6 |
|
| 2 | it was difficult for [noun pl] [to-vb] | 6 |
|
| 3 | it was difficult [prep] [noun pl] [to-vb] | 6 |
|
| 4 | it was difficult for [noun pl] [to-vb] | 6 |
|
