| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | while at the same time preserve | 6 |
|
| 2 | while at the same [noun] preserve | 6 |
|
| 3 | while at the same [noun] preserving | 6 |
|
| 4 | while at the same time preserve | 6 |
|
| 5 | while at the same [noun sg] preserve | 6 |
|
