| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] over a [adj] period | 15 |
|
| 2 | [coord] over a [adj] period | 11 |
|
| 3 | [conj] over a long period | 11 |
|
| 4 | [conj] over a long period | 9 |
|
| 5 | that over a [adj] period | 6 |
|
| 6 | [that] over a [adj] period | 6 |
|
| 7 | that over a [adj] period | 6 |
|
| 8 | or over a [adj] period | 6 |
|
| 9 | or over a [adj] period | 6 |
|
