| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a period [prep] [noun] | 296 |
|
| 2 | over a [noun sg] [prep] years | 160 |
|
| 3 | over a [noun] [prep] years | 160 |
|
| 4 | over a period [prep] [noun pl] | 110 |
|
| 5 | [prep] a period [prep] years | 70 |
|
| 6 | over a period [prep] years | 62 |
|
| 7 | over a period [prep] years | 62 |
|
| 8 | over a period [prep] years | 62 |
|
| 9 | over [art] period [prep] years | 62 |
|
| 10 | over [art] period [prep] years | 62 |
|
| 11 | over a period [prep] year | 62 |
|
