| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] over a period [prep] | 295 |
|
| 2 | [adj] [noun] over a period | 111 |
|
| 3 | [adj] over a period [prep] | 28 |
|
| 4 | [adj] [noun] a period [prep] | 9 |
|
