| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [det] years | 581 |
|
| 2 | [adv prt] [prep] a [det] | 391 |
|
| 3 | [adv prt] [prep] [det] years | 64 |
|
| 4 | [adv prt] a [det] years | 30 |
|
