| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | of [adj] years | 2339 |
|
| 2 | of [num] years | 1845 |
|
| 3 | [prep] 15 years | 284 |
|
| 4 | of 15 [noun] | 232 |
|
| 5 | of 15 [noun pl] | 144 |
|
| 6 | of 15 year | 36 |
|
| 7 | of 15 years | 34 |
|
