| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had had [art] [adj] impact on | 6 |
|
| 2 | had had [art] [adj] impact [prep] | 6 |
|
| 3 | had had [art] [adj] impact [prep] | 6 |
|
| 4 | had had [art] [adj] impact on | 6 |
|
