| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] over a [num] year period | 43 |
|
| 2 | [noun sg] [prep] a [num] year period | 34 |
|
| 3 | [noun pl] [prep] a [num] year period | 24 |
|
| 4 | [noun] [prep] a three year period | 14 |
|
| 5 | [noun] [prep] a five year period | 13 |
|
| 6 | [noun] [prep] a two year period | 13 |
|
| 7 | [noun] for a [num] year period | 8 |
|
| 8 | [noun] during a [num] year period | 6 |
|
| 9 | [noun prp] [prep] a [num] year period | 5 |
|
