| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a three [noun] period [prep] | 5 |
|
| 2 | [prep] a three [noun] period [prep] | 5 |
|
| 3 | [prep] a three [noun] period [prep] | 5 |
|
| 4 | over a three [noun] period [prep] | 5 |
|
