| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | solution to the problem of | 125 |
|
| 2 | solution to the problem of | 98 |
|
| 3 | solution to the problem of | 92 |
|
| 4 | solution to the problems of | 33 |
|
| 5 | solutions to the problem of | 27 |
|
