| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over [art] period [prep] time | 188 |
|
| 2 | over [art] period [prep] time | 188 |
|
| 3 | over [art] period of time | 188 |
|
| 4 | over a period [prep] time | 185 |
|
| 5 | over a period [prep] time | 184 |
|
