| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period [prep] | 176 |
|
| 2 | over a [adj] period [prep] | 166 |
|
| 3 | over a [adj] period of | 137 |
|
| 4 | over a long period [prep] | 93 |
|
| 5 | over a long period [prep] | 85 |
|
| 6 | over a [adj -er] period [prep] | 10 |
|
| 7 | over a short period [prep] | 9 |
|
| 8 | over a prolonged period [prep] | 9 |
|
| 9 | over a prolonged period [prep] | 9 |
|
| 10 | over a longer period [prep] | 8 |
|
| 11 | over a short period [prep] | 8 |
|
| 12 | over a considerable period [prep] | 7 |
|
| 13 | over a considerable period [prep] | 7 |
|
| 14 | over a given period [prep] | 6 |
|
| 15 | over a [adj] period in | 6 |
|
| 16 | over a given period [prep] | 6 |
|
| 17 | over a [adj] period from | 5 |
|
| 18 | over a [adj] period to | 5 |
|
