| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [noun] [prep] a period | 85 |
|
| 2 | [noun] [noun sg] [prep] a period | 61 |
|
| 3 | [noun] [noun] over a period | 40 |
|
| 4 | [noun] [noun pl] [prep] a period | 32 |
|
| 5 | [noun] [noun] for a period | 30 |
|
| 6 | [noun prp] [noun] [prep] a period | 14 |
|
| 7 | [noun] [noun prp] [prep] a period | 9 |
|
| 8 | [noun] [noun] in a period | 9 |
|
| 9 | [noun] [noun] after a period | 7 |
|
| 10 | [noun] [noun] during a period | 5 |
|
