| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun sg] at a [adj] | 314 |
|
| 2 | [prep] [noun sg] at [adj] time | 197 |
|
| 3 | [noun sg] at a [adj] time | 129 |
|
| 4 | [prep] [noun sg] at a time | 75 |
|
| 5 | [prep] [noun sg] a [adj] time | 20 |
|
