| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] three years | 605 |
|
| 2 | [noun sg] [prep] three years | 444 |
|
| 3 | period [prep] [adj] years | 346 |
|
| 4 | period [prep] [num] years | 327 |
|
| 5 | period [prep] three [noun pl] | 82 |
|
| 6 | period [prep] three [noun] | 82 |
|
| 7 | period [prep] three years | 47 |
|
| 8 | period [prep] three year | 44 |
|
| 9 | period [prep] three years | 44 |
|
