| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have served [prep] a [noun sg] | 40 |
|
| 2 | have served as a [noun sg] | 37 |
|
| 3 | have served as a [noun sg] | 37 |
|
| 4 | had served [prep] a [noun sg] | 13 |
|
| 5 | has served [prep] a [noun sg] | 11 |
|
| 6 | have served [prep] a [noun sg] | 10 |
|
| 7 | have served [prep] a model | 5 |
|
