| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] as an | 4747 |
|
| 2 | serve as [art] | 1139 |
|
| 3 | serve as [art] | 1139 |
|
| 4 | serve as a | 980 |
|
| 5 | serve [prep] an | 191 |
|
| 6 | serve [prep] an | 191 |
|
| 7 | serve as an | 155 |
|
