| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun sg] over a [adj] period | 31 |
|
| 2 | [prep] [noun sg] [prep] a long period | 31 |
|
| 3 | [prep] [noun] over a long period | 31 |
|
| 4 | [prep] [noun sg] [prep] a long period | 31 |
|
| 5 | [prep] [noun sg] over a long period | 20 |
|
| 6 | [prep] [noun sg] over [art] long period | 20 |
|
| 7 | [prep] [noun sg] over a long [noun] | 20 |
|
| 8 | [prep] [noun sg] over a long period | 20 |
|
| 9 | [prep] [noun sg] over [art] long period | 20 |
|
