| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] over a [adj] period | 26 |
|
| 2 | [adv] over a long period | 18 |
|
| 3 | [adv prt] over a [adj] period | 13 |
|
| 4 | in over a [adj] period | 5 |
|
| 5 | in over a [adj] period | 5 |
|
| 6 | out over a [adj] period | 5 |
|
| 7 | out over a [adj] period | 5 |
|
