| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | and over a period [prep] | 12 |
|
| 2 | and over [art] period of | 12 |
|
| 3 | and over [art] period [prep] | 12 |
|
| 4 | and over a period [prep] | 12 |
|
| 5 | and over [art] period [prep] | 12 |
|
| 6 | and over [art] period of | 12 |
|
