| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] year | 891 |
|
| 2 | [prep] a [num] year | 491 |
|
| 3 | [prep] a four [noun] | 135 |
|
| 4 | [prep] a four [noun sg] | 129 |
|
| 5 | [prep] [art] four year | 23 |
|
| 6 | [prep] [art] four year | 23 |
|
| 7 | [prep] a four year | 18 |
|
| 8 | [prep] a four year | 18 |
|
| 9 | [prep] a four year | 18 |
|
| 10 | [prep] a four year | 18 |
|
