| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] a [adj] contribution to | 55 |
|
| 2 | made a [adj] contribution to | 53 |
|
| 3 | [vb past] a major contribution to | 16 |
|
| 4 | [vb past] a major contribution to | 16 |
|
| 5 | [vb past] a significant contribution to | 9 |
|
| 6 | [vb past] a significant contribution to | 9 |
|
