| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | contributed to a [noun sg] | 40 |
|
| 2 | have contributed to a | 27 |
|
| 3 | have to a [noun sg] | 16 |
|
| 4 | have contributed a [noun sg] | 10 |
|
| 5 | have contributed to [noun sg] | 7 |
|
