| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | problem [vb mod] be found | 13 |
|
| 2 | problem [vb mod] be found | 13 |
|
| 3 | problem [vb mod] [be] found | 13 |
|
| 4 | problem [vb mod] [be] found | 10 |
|
| 5 | problem can [be] found | 7 |
|
