| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] have contributed to the [adj] | 18 |
|
| 2 | [vb mod] [vb infin] contributed to the [adj] | 18 |
|
| 3 | [vb mod] have contributed to the [adj] | 18 |
|
| 4 | [vb mod] [verb] contributed to the [adj] | 17 |
|
| 5 | may [verb] contributed to the [adj] | 11 |
|
