No | Pattern | Freq | Relations |
---|---|---|---|
1 | [adv] over a period [prep] time | 22 | |
2 | [adv] over a period of time | 22 | |
3 | [adv prt] over a period [prep] time | 12 | |
4 | [adv] over a period [prep] time | 9 | |
5 | up over a period [prep] time | 5 | |
6 | up over a period [prep] time | 5 |