| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | of [noun] [prep] a period | 47 |
|
| 2 | of [noun sg] [prep] a period | 32 |
|
| 3 | of [noun] over a period | 20 |
|
| 4 | of [noun pl] [prep] a period | 12 |
|
| 5 | of [noun] for a period | 9 |
|
| 6 | of [noun] in a period | 6 |
|
