| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period of [noun] | 130 |
|
| 2 | over a [adj] period of [noun] | 123 |
|
| 3 | [prep] a long period of [noun] | 116 |
|
| 4 | [prep] a long period of [noun] | 116 |
|
| 5 | over a long period of [noun] | 81 |
|
| 6 | over a long period [prep] [noun] | 78 |
|
| 7 | over a long period [prep] [noun] | 78 |
|
| 8 | over a long [noun] of [noun] | 76 |
|
| 9 | over [art] long period of [noun] | 75 |
|
| 10 | over a long period of [noun] | 75 |
|
| 11 | over a long period of [noun] | 75 |
|
