| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period [prep] time | 123 |
|
| 2 | over a [adj] period [prep] time | 116 |
|
| 3 | [prep] a long period [prep] time | 88 |
|
| 4 | [prep] a long period [prep] time | 88 |
|
| 5 | over a long period [prep] [noun] | 78 |
|
| 6 | over a long period [prep] time | 77 |
|
| 7 | over a long period [prep] time | 71 |
|
| 8 | over a long period [prep] time | 71 |
|
| 9 | over [art] long period [prep] time | 71 |
|
| 10 | over a long [noun] [prep] time | 71 |
|
