| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun pl] officers at | 6 |
|
| 2 | [prep] [noun pl] officers at | 6 |
|
| 3 | by [noun pl] officers at | 5 |
|
| 4 | by [noun pl] officers at | 5 |
|
