No | Pattern | Freq | Relations |
---|---|---|---|
1 | [prep] a period [prep] time | 239 | |
2 | [prep] a period of time | 239 | |
3 | [prep] a period [prep] time | 239 | |
4 | over a period [prep] time | 184 | |
5 | over a period [prep] time | 184 | |
6 | for a period [prep] time | 33 | |
7 | for a period [prep] time | 33 | |
8 | after a period [prep] time | 10 | |
9 | after a period [prep] time | 10 |