No | Pattern | Freq | Relations |
---|---|---|---|
1 | over a long period [prep] [noun] | 78 | |
2 | over a long period of [noun] | 75 | |
3 | over a long period of [noun] | 75 | |
4 | over a long period [prep] [noun sg] | 74 | |
5 | over a long period [prep] time | 71 | |
6 | over a long period [prep] time | 71 |