| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period be | 11 |
|
| 2 | over a [adj] period [be] | 11 |
|
| 3 | over a [adj] period [be] | 9 |
|
| 4 | over a [adj] period [is] | 8 |
|
| 5 | over a [adj] period is | 8 |
|
