| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [noun pl] over a period of | 47 |
|
| 2 | [num] [noun pl] [prep] a period of | 18 |
|
| 3 | [num] [noun pl] [prep] a period of | 18 |
|
| 4 | [num] [noun pl] over a [noun] of | 17 |
|
| 5 | [num] [noun] over a period of | 15 |
|
| 6 | [num] [noun pl] over [art] period of | 13 |
|
| 7 | [num] [noun pl] over [art] period of | 13 |
|
| 8 | [num] [noun pl] over a period of | 12 |
|
| 9 | [num] [noun pl] over a period of | 12 |
|
| 10 | [num] [noun pl] over a period [prep] | 12 |
|
| 11 | [num] [noun pl] over a period [prep] | 12 |
|
| 12 | [num] [noun pl] over a period of | 12 |
|
