| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [verb] made a significant contribution | 5 |
|
| 2 | [verb] made a significant contribution [prep] | 13 |
|
| 3 | [verb] made a significant contribution to | 13 |
|
| 4 | [verb] made a significant contribution [prep] | 13 |
|
| 5 | [verb] made a significant contribution to | 13 |
|
