| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult it [is] [prep] | 26 |
|
| 2 | difficult it is [prep] | 26 |
|
| 3 | difficult it [is] [prep] | 26 |
|
| 4 | difficult it [is] for | 22 |
|
| 5 | difficult it [is] for | 22 |
|
