No | Pattern | Freq | Relations |
---|---|---|---|
1 | has [vb pp] [art] important contribution | 6 | |
2 | has [verb] [art] important contribution | 6 | |
3 | has [verb] an important contribution | 6 | |
4 | has make [art] important contribution | 5 | |
5 | has made [art] important contribution | 5 |