| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [noun] [prep] four years | 47 |
|
| 2 | [adj] [noun sg] [prep] four years | 43 |
|
| 3 | [adj] [noun] for four years | 26 |
|
| 4 | [adj] [noun] of four years | 9 |
|
| 5 | [adj] period [prep] four years | 5 |
|
| 6 | [adj] period [prep] four years | 5 |
|
| 7 | [adj] [noun] after four years | 5 |
|
