| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] or [art] | 51 |
|
| 2 | [to-vb] maintain [art] | 35 |
|
| 3 | or maintain [art] | 27 |
|
| 4 | [to-vb] or maintain | 24 |
|
