| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a difficult time | 24 |
|
| 2 | at a difficult time | 13 |
|
| 3 | at a difficult time | 13 |
|
| 4 | through a difficult time | 7 |
|
| 5 | through a difficult time | 7 |
|
