| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a long period of | 62 |
|
| 2 | [noun] [prep] a long period of | 62 |
|
| 3 | [noun sg] [prep] a long period of | 50 |
|
| 4 | [noun] over a long period of | 40 |
|
| 5 | [noun] over a long period of | 40 |
|
| 6 | [noun] of a long period of | 10 |
|
| 7 | [noun] of a long period of | 10 |
|
| 8 | [noun pl] [prep] a long period of | 10 |
|
| 9 | [noun] for a long period of | 6 |
|
| 10 | [noun] for a long period of | 6 |
|
