| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [num] [noun] | 5049 |
|
| 2 | a [num] [noun] period | 236 |
|
| 3 | [prep] a [noun] period | 109 |
|
| 4 | [prep] [num] [noun] period | 23 |
|
