| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [verb] to the [adj] | 572 |
|
| 2 | difficulty [prep] [verb] the [adj] | 118 |
|
| 3 | difficulty [prep] [verb] to the | 13 |
|
| 4 | difficulty [prep] [verb] to [adj] | 9 |
|
