| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period [coord] | 20 |
|
| 2 | over a [adj] period and | 18 |
|
| 3 | over a [adj] period and | 18 |
|
| 4 | over a long period [conj] | 10 |
|
