| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] over a period [prep] | 105 |
|
| 2 | [noun pl] over a period [prep] | 105 |
|
| 3 | [noun pl] over a period of | 102 |
|
| 4 | [noun pl] over a period of | 102 |
|
