| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] four hours ['s] | 7 |
|
| 2 | [prep] four hours ['s] | 7 |
|
| 3 | four hours ['s] [noun sg] | 16 |
|
| 4 | four hours ['s] [noun] | 16 |
|
