| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] year period | 71 |
|
| 2 | over a [num] year period | 71 |
|
| 3 | [prep] a two year period | 19 |
|
| 4 | [prep] a two year period | 19 |
|
| 5 | over a two [noun sg] period | 17 |
|
| 6 | over a two [noun] period | 17 |
|
| 7 | over [art] two year period | 12 |
|
| 8 | over a two year period | 11 |
|
| 9 | over a two year [noun sg] | 11 |
|
| 10 | over a two year [noun] | 11 |
|
| 11 | over a two year period | 11 |
|
| 12 | over a two year period | 11 |
|
| 13 | over a two year period | 11 |
|
