| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] 15 years [noun] | 10 |
|
| 2 | [prep] 15 years [noun] | 10 |
|
| 3 | 15 years [prep] [noun] | 56 |
|
| 4 | 15 years [prep] [noun] | 56 |
|
| 5 | 15 years ' [noun] | 29 |
|
| 6 | 15 years [unc] [noun] | 29 |
|
| 7 | 15 years ['s] [noun] | 29 |
|
| 8 | 15 years ' [noun] | 29 |
|
| 9 | 15 years of [noun] | 27 |
|
| 10 | 15 years of [noun] | 27 |
|
| 11 | 15 years in [noun] | 14 |
|
| 12 | 15 years in [noun] | 14 |
|
| 13 | 15 years [adj] [noun] | 7 |
|
| 14 | 15 years [adj] [noun] | 5 |
|
| 15 | 15 years [adv] [noun] | 5 |
|
