| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been no problem | 25 |
|
| 2 | have been no problem | 13 |
|
| 3 | have been no problems | 12 |
|
| 4 | had been no problem | 9 |
|
| 5 | have been no problem | 8 |
|
| 6 | have been no problem | 5 |
|
