| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [det] years | 581 |
|
| 2 | [noun prp] [prep] [det] years | 195 |
|
| 3 | [noun prp] [prep] a [det] | 165 |
|
| 4 | [noun prp] a [det] years | 59 |
|
