| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] a [noun] [prep] | 27294 |
|
| 2 | [adv] [art] period [prep] | 163 |
|
| 3 | [adv] [art] period [prep] | 163 |
|
| 4 | [adv] a period [prep] | 117 |
|
