| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | fifteen years [adj -er] [subord] [pers pn] | 6 |
|
| 2 | fifteen years [adj] [subord] [pers pn] | 6 |
|
| 3 | fifteen years [subord] [pers pn] [verb] | 7 |
|
| 4 | fifteen years [subord] [pers pn] [vb past] | 5 |
|
