| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | you must keep [prep] [art] | 6 |
|
| 2 | you must keep [prep] the | 6 |
|
| 3 | you must keep [prep] [art] | 6 |
|
| 4 | you must keep [prep] the | 6 |
|
