| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [num] year ' [noun] | 1138 |
|
| 2 | [num] [noun] ' duration | 95 |
|
| 3 | [num] year ['s] duration | 76 |
|
| 4 | [num] year [unc] duration | 76 |
|
| 5 | [adj] year ' duration | 71 |
|
| 6 | [num] year ' duration | 70 |
|
