| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] difficult to make | 24 |
|
| 2 | it [is] difficult [noun] | 9 |
|
| 3 | it difficult to make [noun] | 9 |
|
| 4 | [is] difficult to make [noun] | 7 |
|
| 5 | it [is] to make [noun] | 7 |
|
