| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | period he should serve | 6 |
|
| 2 | [noun] he should serve | 6 |
|
| 3 | [noun sg] he should serve | 6 |
|
| 4 | period he should serve | 6 |
|
| 5 | he should serve [prep] | 8 |
|
| 6 | he should serve [prep] | 8 |
|
| 7 | he should serve for | 5 |
|
| 8 | he should serve for | 5 |
|
