| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] have developed a [noun] | 32 |
|
| 2 | [noun pl] [verb] developed a [noun sg] | 30 |
|
| 3 | [noun pl] have developed a [noun] | 25 |
|
| 4 | [noun pl] [vb base] developed a [noun] | 25 |
|
| 5 | scientists [verb] developed a [noun] | 5 |
|
