| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] year period | 71 |
|
| 2 | over a [num] year period | 71 |
|
| 3 | over a three [noun] period | 21 |
|
| 4 | over a three [noun sg] period | 21 |
|
| 5 | [prep] a three year period | 17 |
|
| 6 | [prep] a three year period | 17 |
|
| 7 | over [art] three year period | 14 |
|
| 8 | over [art] three year period | 14 |
|
| 9 | over a three year period | 11 |
|
| 10 | over a three year period | 11 |
|
| 11 | over a three year period | 11 |
|
| 12 | over a three year [noun] | 11 |
|
| 13 | over a three year period | 11 |
|
| 14 | over a three year period | 11 |
|
| 15 | over a three year [noun sg] | 11 |
|
