| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | problem that [vb mod] arise | 38 |
|
| 2 | problems that [vb mod] arise | 36 |
|
| 3 | problem that may arise | 16 |
|
| 4 | problem that can arise | 9 |
|
| 5 | problem that might arise | 7 |
|
