| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at the same time maintain | 14 |
|
| 2 | at the same time maintain | 14 |
|
| 3 | at [art] same time maintain | 14 |
|
| 4 | at [art] same time maintain | 14 |
|
| 5 | at [art] same time maintaining | 9 |
|
