No | Pattern | Freq | Relations |
---|---|---|---|
1 | over a period [prep] [noun] | 296 | |
2 | over a period of [noun] | 296 | |
3 | over a period [prep] [noun sg] | 186 | |
4 | over a period [prep] time | 184 | |
5 | over a period [prep] time | 184 | |
6 | over a period [prep] [noun pl] | 110 | |
7 | over a period [prep] year | 62 | |
8 | over a period [prep] years | 62 | |
9 | over a period [prep] week | 19 | |
10 | over a period [prep] weeks | 19 | |
11 | over a period [prep] months | 17 | |
12 | over a period [prep] month | 17 |