| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period of [noun] | 126 |
|
| 2 | over a [adj] [noun] of years | 11 |
|
| 3 | over a [adj] [noun sg] of years | 11 |
|
| 4 | [prep] a [adj] period of years | 6 |
|
| 5 | [prep] a [adj] period of years | 6 |
|
| 6 | over a [adj] period of years | 5 |
|
| 7 | over a [adj] period [prep] years | 5 |
|
| 8 | over [art] [adj] period of years | 5 |
|
| 9 | over a [adj] period [prep] years | 5 |
|
| 10 | over a [adj] period of years | 5 |
|
| 11 | over [art] [adj] period of years | 5 |
|
| 12 | over a [adj] period of years | 5 |
|
| 13 | over a [adj] period of year | 5 |
|
| 14 | over a [adj] period of [noun pl] | 5 |
|
| 15 | over a [adj] period of years | 5 |
|
