| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [det] [noun] [unc] | 155 |
|
| 2 | [prep] a [adj] year [unc] | 69 |
|
| 3 | [prep] a [det] year [unc] | 29 |
|
| 4 | [prep] [art] [det] year [unc] | 29 |
|
