| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] a [noun] [prep] | 6580 |
|
| 2 | [adv] [prep] a period [prep] | 93 |
|
| 3 | [prep] a [noun] period [prep] | 46 |
|
| 4 | [adv] [prep] a [noun] period | 10 |
|
