| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] back to [art] safety | 6 |
|
| 2 | back to [art] safety [prep] | 12 |
|
| 3 | back to [art] safety [prep] | 12 |
|
| 4 | back to [art] safety of | 12 |
|
| 5 | back to [art] safety of | 12 |
|
