| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | after [adj] years | 1853 |
|
| 2 | after [num] years | 1681 |
|
| 3 | [prep] fifteen years | 178 |
|
| 4 | after fifteen [noun pl] | 33 |
|
| 5 | after fifteen [noun] | 33 |
|
| 6 | after fifteen years | 13 |
|
| 7 | after fifteen year | 13 |
|
