| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | back [noun pl] of | 54 |
|
| 2 | back [noun sg] of | 28 |
|
| 3 | back memories of | 24 |
|
| 4 | back memory of | 24 |
|
| 5 | back sort of | 7 |
|
| 6 | back sort of | 7 |
|
| 7 | back [n mass] of | 6 |
|
