| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] and [adv] | 4518 |
|
| 2 | [vb pp] and maintain | 111 |
|
| 3 | and [adv] maintain | 89 |
|
| 4 | [vb pp] [adv] maintain | 22 |
|
