| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a period of [adj] week | 17 |
|
| 2 | over a period of [adj] weeks | 17 |
|
| 3 | over a period of [num] week | 13 |
|
| 4 | over a period of three week | 6 |
|
| 5 | over a period of three week | 6 |
|
