| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [verb] a [adj] contribution to | 8 |
|
| 2 | is [verb] a [adj] contribution to | 8 |
|
| 3 | is make a [adj] contribution to | 8 |
|
| 4 | is making a [adj] contribution to | 6 |
|
| 5 | is [v-ing] a [adj] contribution to | 6 |
|
