| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | there had [been] difficulty | 6 |
|
| 2 | [pron] had [been] difficulty | 6 |
|
| 3 | there had [been] difficulty | 6 |
|
| 4 | [ex0] had [been] difficulty | 6 |
|
