| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] this problem has been [verb] | 7 |
|
| 2 | [prep] this problem has been [verb] | 7 |
|
| 3 | to this problem has been [verb] | 5 |
|
| 4 | to this problem has been [verb] | 5 |
|
| 5 | this problem has been [verb] [prep] | 8 |
|
| 6 | this problem has been [verb] [prep] | 8 |
|
| 7 | this problem has been [verb] by | 5 |
|
| 8 | this problem has been [verb] by | 5 |
|
| 9 | this problem has been [verb] [adv] | 5 |
|
