No | Pattern | Freq | Relations |
---|---|---|---|
1 | over a period [prep] [art] [noun sg] | 16 | |
2 | over a period [prep] [art] [noun] | 16 | |
3 | over a period [prep] a [noun] | 15 | |
4 | over a period of [art] [noun] | 15 | |
5 | over a period [prep] [art] year | 5 | |
6 | over a period [prep] [art] year | 5 |