| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] over a period of | 289 |
|
| 2 | [noun pl] [prep] a period of | 183 |
|
| 3 | [noun pl] [prep] a period of | 183 |
|
| 4 | [noun pl] over a [noun] of | 166 |
|
| 5 | [noun pl] over [art] period of | 113 |
|
| 6 | [noun pl] over a period [prep] | 105 |
|
| 7 | [noun pl] over a period [prep] | 105 |
|
| 8 | [noun pl] over a period of | 102 |
|
| 9 | [noun pl] over a period of | 102 |
|
