| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over [art] [det] period [prep] [adj] | 12 |
|
| 2 | over [art] [det] period [prep] [num] | 11 |
|
| 3 | over [art] [det] period [prep] 1990 | 5 |
|
| 4 | over [art] [det] period [prep] 1990 | 5 |
|
