| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] a [noun] [prep] | 13410 |
|
| 2 | [adv] [prep] a [noun sg] [prep] | 12973 |
|
| 3 | [adv] [prep] [art] period [prep] | 234 |
|
| 4 | [adv] [prep] a period [prep] | 138 |
|
| 5 | [adv] [prep] a period [prep] | 138 |
|
