| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over the period [verb] | 16 |
|
| 2 | over [art] period [vb pp] | 9 |
|
| 3 | over a period [verb] | 7 |
|
| 4 | over [art] period covered | 5 |
|
| 5 | over [art] period cover | 5 |
|
