| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] 25 years [unc] service | 7 |
|
| 2 | [prep] 25 years [unc] service | 7 |
|
| 3 | 25 years [unc] service [prep] | 6 |
|
| 4 | 25 years [unc] service [prep] | 6 |
|
