| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adv] investigated at the [noun sg] | 7 |
|
| 2 | be [adv] investigated at the time | 6 |
|
| 3 | be [adv] investigated at the time | 6 |
|
| 4 | was [adv] investigated at the [noun] | 5 |
|
| 5 | be properly investigated at the [noun] | 5 |
|
