| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | two years ' [noun] | 173 |
|
| 2 | [adj] years ' service | 118 |
|
| 3 | two years [unc] service | 8 |
|
| 4 | two year ' service | 8 |
|
| 5 | two [noun] ' service | 8 |
|
| 6 | two [noun pl] ' service | 8 |
|
