| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a period of two [noun pl] | 25 |
|
| 2 | over a period of two [noun] | 25 |
|
| 3 | over a period of two years | 12 |
|
| 4 | over a period of two year | 12 |
|
| 5 | over a period of two month | 6 |
|
| 6 | over a period of two months | 6 |
|
