| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [det] years | 581 |
|
| 2 | [prep] [det] years [prep] | 555 |
|
| 3 | a [det] years [prep] | 246 |
|
| 4 | [prep] a [det] [prep] | 150 |
|
