No | Pattern | Freq | Relations |
---|---|---|---|
1 | be [prep] three years ' duration | 24 | |
2 | [be] [prep] three years ' duration | 24 | |
3 | [is] [prep] three years ' duration | 24 | |
4 | [be] [prep] three years ' duration | 24 | |
5 | is [prep] three years ' duration | 24 | |
6 | [be] of three years ' duration | 24 |