| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] three years | 605 |
|
| 2 | degree [prep] [num] years | 8 |
|
| 3 | degree [prep] [adj] years | 8 |
|
| 4 | degree [prep] three [noun] | 6 |
|
| 5 | degree [prep] three year | 6 |
|
| 6 | degree [prep] three years | 6 |
|
| 7 | degree [prep] three [noun pl] | 6 |
|
| 8 | degree [prep] three years | 6 |
|
