| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period [prep] [art] | 14 |
|
| 2 | over a [adj] period [prep] the | 10 |
|
| 3 | over a long period [prep] [art] | 6 |
|
| 4 | over a [adj] period [prep] a | 5 |
|
