| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [det] years | 581 |
|
| 2 | [prep] a [adv] [det] | 208 |
|
| 3 | [prep] [adv] [det] years | 176 |
|
| 4 | a [adv] [det] years | 12 |
|
