| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] at [art] | 8757 |
|
| 2 | back at [art] | 799 |
|
| 3 | [v-ing] back [art] | 399 |
|
| 4 | [v-ing] back at | 267 |
|
