| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to [art] problem | 715 |
|
| 2 | to the problem | 638 |
|
| 3 | to the problem | 638 |
|
| 4 | to a problem | 69 |
|
| 5 | to a problem | 69 |
|
| 6 | to every problem | 8 |
|
| 7 | to every problem | 8 |
|
