| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] over a [adj] period | 289 |
|
| 2 | [noun] over a [adj] period | 262 |
|
| 3 | [noun] [prep] a prolonged period | 25 |
|
| 4 | [noun] [prep] a prolonged period | 25 |
|
| 5 | [noun] over a prolonged period | 12 |
|
| 6 | [noun] over a prolonged period | 12 |
|
| 7 | [noun] over a prolonged [noun] | 12 |
|
| 8 | [noun] over a prolonged period | 12 |
|
| 9 | [noun] over [art] prolonged period | 12 |
|
| 10 | [noun] over a prolonged period | 12 |
|
| 11 | [noun] over [art] prolonged period | 12 |
|
| 12 | [noun] over a prolonged [noun sg] | 12 |
|
