| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | serve as [noun pl] | 37 |
|
| 2 | to serve as [noun pl] | 21 |
|
| 3 | served as [noun pl] | 20 |
|
| 4 | serve as [noun pl] | 16 |
|
| 5 | served as [noun pl] | 15 |
|
| 6 | serving as [noun pl] | 14 |
|
