| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] to the [adj] problem [prep] | 22 |
|
| 2 | [noun sg] to the [adj] problem of | 17 |
|
| 3 | [noun sg] to the [adj] problem of | 17 |
|
| 4 | solution to the [adj] problem [prep] | 11 |
|
