| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] [prep] [num] years [noun sg] | 13 |
|
| 2 | [noun prp] [prep] [num] years service | 6 |
|
| 3 | [noun prp] [prep] [num] years service | 6 |
|
| 4 | [noun prp] after [num] years [noun] | 6 |
|
