| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [verb] [coord] maintain the | 6 |
|
| 2 | [vb mod] [verb] and maintain the | 6 |
|
| 3 | [vb mod] [verb] and maintain the | 6 |
|
| 4 | [vb mod] [verb] [conj] maintain the | 6 |
|
