| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] long period of | 174 |
|
| 2 | [prep] [art] long period of | 174 |
|
| 3 | over [art] [adj] period of | 162 |
|
| 4 | over [art] long period [prep] | 95 |
|
| 5 | over [art] long period [prep] | 95 |
|
| 6 | over [art] long [noun] of | 90 |
|
| 7 | over [art] long period of | 85 |
|
| 8 | over [art] long period of | 85 |
|
