| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun] at the time | 593 |
|
| 2 | [prep] duty at the [noun] | 33 |
|
| 3 | [prep] duty at [art] time | 7 |
|
| 4 | [prep] duty at the time | 7 |
|
| 5 | [prep] duty [prep] the time | 7 |
|
| 6 | [prep] duty [prep] the time | 7 |
|
| 7 | [prep] duty at the time | 7 |
|
| 8 | [prep] duty at [art] time | 7 |
|
| 9 | [prep] duty at the time | 7 |
|
