| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | was [verb] at [adv] [n mass] | 15 |
|
| 2 | was [vb pp] at [adv] [noun] | 13 |
|
| 3 | was [verb] at about [noun] | 9 |
|
| 4 | was estimate at [adv] [noun] | 7 |
|
| 5 | was estimated at [adv] [noun] | 7 |
|
