| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | research [vb pp] out [prep] the [noun] | 19 |
|
| 2 | research carried out [prep] the [noun] | 19 |
|
| 3 | research [vb pp] out [prep] the [noun sg] | 14 |
|
| 4 | research [vb pp] out by the [noun] | 12 |
|
| 5 | research [vb pp] out by the [noun] | 12 |
|
