| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [num] year | 491 |
|
| 2 | [prep] a [num] year | 491 |
|
| 3 | by a [num] [noun] | 202 |
|
| 4 | by a [num] [noun sg] | 138 |
|
| 5 | by a [adj] year | 27 |
|
| 6 | by [art] [num] year | 26 |
|
| 7 | by a [num] year | 26 |
|
| 8 | by [art] [num] year | 26 |
|
| 9 | by a [num] year | 23 |
|
| 10 | by a [num] year | 21 |
|
