| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | of [adj] years ' service | 9 |
|
| 2 | of [adj] years [unc] service | 9 |
|
| 3 | of [adj] years ' service | 9 |
|
| 4 | of [adj] years ['s] service | 9 |
|
| 5 | of [num] years [unc] service | 8 |
|
