| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a long period | 137 |
|
| 2 | [noun sg] [prep] a long period | 129 |
|
| 3 | [noun] over a long period | 120 |
|
| 4 | [noun pl] [prep] a long period | 42 |
|
| 5 | [noun] [prep] a longer period | 40 |
|
| 6 | [noun] for a long period | 35 |
|
| 7 | [noun] of a long period | 12 |
|
| 8 | [noun] after a long period | 5 |
|
