| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] the problem is | 80 |
|
| 2 | if [art] problem is | 28 |
|
| 3 | when [art] problem is | 15 |
|
| 4 | where [art] problem is | 14 |
|
| 5 | [subord] a problem is | 10 |
|
| 6 | whether [art] problem is | 7 |
|
