| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [num] [noun] [art] | 69 |
|
| 2 | [prep] a [num] [noun pl] [art] | 52 |
|
| 3 | [prep] a [adj] years [art] | 38 |
|
| 4 | [prep] [art] [num] years [art] | 19 |
|
| 5 | [prep] [art] [num] years [art] | 19 |
|
| 6 | [prep] a [num] year [art] | 7 |
|
| 7 | [prep] a [num] years [art] | 7 |
|
| 8 | [prep] a [num] years [art] | 7 |
|
