| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | back at [adj] [noun] | 87 |
|
| 2 | back [prep] [adj] office | 13 |
|
| 3 | back [prep] [adj] office | 13 |
|
| 4 | [adv] at [adj] office | 9 |
|
| 5 | [adv prt] at [adj] office | 6 |
|
| 6 | back at [adj] office | 5 |
|
| 7 | back at [adj] office | 5 |
|
