| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] four year | 11 |
|
| 2 | for a [adj] four year | 8 |
|
| 3 | [prep] a [adj] four years | 6 |
|
| 4 | [prep] a [adj -er] four year | 5 |
|
| 5 | [prep] a further four year | 5 |
|
| 6 | [prep] a [adj] four year | 5 |
|
| 7 | [prep] a far four year | 5 |
|
