| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] [noun] [prep] a period | 22 |
|
| 2 | and [noun] [prep] a period | 15 |
|
| 3 | [coord] [noun sg] [prep] a period | 12 |
|
| 4 | [coord] [noun] over a period | 10 |
|
| 5 | [coord] [noun] over a period | 10 |
|
| 6 | or [noun] [prep] a period | 7 |
|
| 7 | [coord] [noun pl] [prep] a period | 5 |
|
| 8 | [coord] [noun prp] [prep] a period | 5 |
|
