| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] long period of | 105 |
|
| 2 | [prep] long period of | 105 |
|
| 3 | over [adj] period of | 55 |
|
| 4 | over [adj] period of | 46 |
|
| 5 | over long [noun] of | 28 |
|
| 6 | over long period [prep] | 26 |
|
| 7 | over long period [prep] | 26 |
|
| 8 | over long period of | 23 |
|
| 9 | over long period of | 23 |
|
| 10 | over long period of | 23 |
|
