| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] than a year | 280 |
|
| 2 | [det] than a [adv] | 144 |
|
| 3 | than a year [adv] | 116 |
|
| 4 | [det] a year [adv] | 11 |
|
