| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | of 15 years ' [noun sg] | 5 |
|
| 2 | of 15 years [unc] [noun sg] | 5 |
|
| 3 | of 15 years ' [noun sg] | 5 |
|
| 4 | of 15 years ['s] [noun sg] | 5 |
|
