| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adj] years [unc] [adj] service | 7 |
|
| 2 | [prep] [adj] years [unc] [adj] service | 7 |
|
| 3 | [adj] years [unc] [adj] service [prep] | 8 |
|
| 4 | [adj] years [unc] [adj] service [prep] | 8 |
|
