| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] and [adv] | 18101 |
|
| 2 | and [adv] maintain | 89 |
|
| 3 | [adv] [adv] maintain | 60 |
|
| 4 | [adv] and maintain | 13 |
|
