| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] over a period of | 60 |
|
| 2 | [adv] over a period of | 34 |
|
| 3 | [adv prt] over a period of | 25 |
|
| 4 | up over a period of | 8 |
|
| 5 | up over a period of | 8 |
|
| 6 | gradually over a period of | 7 |
|
| 7 | gradually over a period of | 7 |
|
| 8 | out over a period of | 5 |
|
| 9 | out over a period of | 5 |
|
