| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long period of | 152 |
|
| 2 | over a [adj] period of | 137 |
|
| 3 | over a long period [prep] | 93 |
|
| 4 | over a long [noun sg] of | 85 |
|
| 5 | over a long [noun] of | 85 |
|
| 6 | over [art] long period of | 85 |
|
| 7 | over [art] long period of | 85 |
|
| 8 | over a long period of | 84 |
|
| 9 | over a long period of | 84 |
|
