| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | back [adj] | 375 |
|
| 2 | back full | 12 |
|
| 3 | back alive | 9 |
|
| 4 | back safe | 8 |
|
| 5 | back empty | 7 |
|
| 6 | back cyclic | 6 |
|
| 7 | back level | 5 |
|
