| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | after [adj] years | 1853 |
|
| 2 | after [num] years | 1681 |
|
| 3 | [prep] 15 years | 284 |
|
| 4 | after 15 [noun] | 74 |
|
| 5 | after 15 [noun pl] | 65 |
|
| 6 | after 15 years | 26 |
|
| 7 | after 15 year | 26 |
|
