| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [det] [noun] [prep] a time | 42 |
|
| 2 | a [det] [noun pl] [prep] a time | 42 |
|
| 3 | a [det] minutes [prep] a time | 7 |
|
| 4 | a [det] minute [prep] a time | 7 |
|
| 5 | a [det] weeks [prep] a time | 6 |
|
| 6 | a [det] week [prep] a time | 6 |
|
