| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a long period of | 70 |
|
| 2 | [noun] [prep] a long period of | 62 |
|
| 3 | [noun sg] [prep] a long period of | 57 |
|
| 4 | [noun] over a long period of | 45 |
|
| 5 | [noun] over a long period of | 45 |
|
| 6 | [noun pl] [prep] a long period of | 11 |
|
| 7 | [noun] of a long period of | 11 |
|
| 8 | [noun] of a long period of | 11 |
|
| 9 | [noun] [prep] a longer period of | 8 |
|
| 10 | [noun] for a long period of | 7 |
|
| 11 | [noun] for a long period of | 7 |
|
