| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have developed a [noun] | 277 |
|
| 2 | have developed a [noun sg] | 265 |
|
| 3 | have [verb] a system | 56 |
|
| 4 | have [vb pp] a system | 52 |
|
| 5 | have developed [art] system | 13 |
|
| 6 | have develop a system | 12 |
|
| 7 | [verb] developed a system | 12 |
|
| 8 | have developed a system | 12 |
|
