| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [coord] [num] years ' duration | 10 |
|
| 2 | [num] [coord] [num] years ' duration | 10 |
|
| 3 | three [coord] [num] years ' duration | 8 |
|
| 4 | three [coord] [num] years ' duration | 8 |
|
