| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [v-ing] [adv prt] [prep] the | 1096 |
|
| 2 | difficulty [prep] [v-ing] [prep] the | 60 |
|
| 3 | difficulty [prep] [v-ing] [adv prt] [prep] | 22 |
|
| 4 | difficulty [prep] [v-ing] [adv prt] the | 9 |
|
