| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [num] [noun] | 5295 |
|
| 2 | [prep] [art] [num] years | 1318 |
|
| 3 | [prep] a [num] [noun pl] | 1272 |
|
| 4 | [prep] a [adj] years | 820 |
|
| 5 | [prep] a [num] year | 757 |
|
| 6 | [prep] a [num] years | 236 |
|
