| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] over a [adj] period [prep] | 67 |
|
| 2 | [noun sg] over a [adj] period [prep] | 65 |
|
| 3 | [noun sg] over a [adj] period of | 57 |
|
| 4 | [noun sg] over a long period [prep] | 41 |
|
| 5 | [noun sg] over a long period [prep] | 37 |
|
| 6 | [noun sg] over a [adj -er] period [prep] | 5 |
|
