| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at a [adj] [noun sg] [prep] [unc] | 21 |
|
| 2 | at a [adj] [noun sg] [prep] [no cls] | 21 |
|
| 3 | at a [adj] [noun sg] of [unc] | 19 |
|
| 4 | at a [adj] rate [prep] [unc] | 7 |
|
