| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] over a period of three | 15 |
|
| 2 | [noun sg] over a period of three | 8 |
|
| 3 | [noun pl] over a period of three | 7 |
|
| 4 | over a period of three [noun] | 19 |
|
| 5 | over a period of three [noun pl] | 19 |
|
| 6 | over a period of three years | 8 |
|
| 7 | over a period of three year | 8 |
|
| 8 | over a period of three weeks | 6 |
|
| 9 | over a period of three week | 6 |
|
