| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [num] [prep] [adj] [noun pl] ' service | 8 |
|
| 2 | [num] [prep] [num] [noun pl] ' service | 8 |
|
| 3 | [num] [prep] [adj] years ' service | 8 |
|
| 4 | [num] after [adj] [noun pl] ' service | 7 |
|
