No | Pattern | Freq | Relations |
---|---|---|---|
1 | over a [num] year period | 71 | |
2 | over the [num] year period | 23 | |
3 | over [art] five year period | 15 | |
4 | over [art] three year period | 14 | |
5 | over [art] two year period | 12 | |
6 | over [art] ten year period | 7 | |
7 | over [art] 20 year period | 7 |