| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] over a prolonged [noun] | 12 |
|
| 2 | [noun] over a prolonged period | 12 |
|
| 3 | [noun] over a prolonged [noun sg] | 12 |
|
| 4 | [noun] over a prolonged period | 12 |
|
| 5 | [noun sg] over a prolonged [noun] | 6 |
|
