| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] [noun sg] period [prep] | 23 |
|
| 2 | over a [num] [noun sg] period [prep] | 21 |
|
| 3 | over a [adj] year period [prep] | 11 |
|
| 4 | over a [adj] [noun sg] period in | 5 |
|
| 5 | over a four [noun sg] period [prep] | 5 |
|
| 6 | over a four [noun sg] period [prep] | 5 |
|
| 7 | over a three [noun sg] period [prep] | 5 |
|
| 8 | over a three [noun sg] period [prep] | 5 |
|
| 9 | over a [adj] [noun sg] period in | 5 |
|
