| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | period [prep] [adj] years | 346 |
|
| 2 | period [prep] [num] years | 327 |
|
| 3 | [noun] [prep] four years | 324 |
|
| 4 | [noun sg] [prep] four years | 251 |
|
| 5 | period [prep] four [noun pl] | 39 |
|
| 6 | period [prep] four [noun] | 39 |
|
| 7 | period [prep] four years | 16 |
|
| 8 | period [prep] four years | 16 |
|
| 9 | period [prep] four year | 16 |
|
| 10 | period [prep] four years | 16 |
|
