| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | back the [noun] of | 187 |
|
| 2 | back the [noun sg] of | 112 |
|
| 3 | back the [noun pl] of | 74 |
|
| 4 | back the frontiers of | 23 |
|
| 5 | back the frontier of | 23 |
|
| 6 | back the tide of | 6 |
|
| 7 | back the tide of | 6 |
|
| 8 | back the boundaries of | 5 |
|
| 9 | back the boundary of | 5 |
|
