| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adj] month ' duration | 7 |
|
| 2 | [prep] [adj] month ' duration | 7 |
|
| 3 | of [adj] month ' duration | 5 |
|
| 4 | of [adj] month ' duration | 5 |
|
