| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a long period | 137 |
|
| 2 | [noun sg] [prep] a long period | 102 |
|
| 3 | [noun] over a long period | 95 |
|
| 4 | [noun pl] [prep] a long period | 29 |
|
| 5 | [noun] for a long period | 24 |
|
| 6 | [noun] of a long period | 10 |
|
| 7 | [noun] after a long period | 5 |
|
