No | Pattern | Freq | Relations |
---|---|---|---|
1 | be [prep] four years ' duration | 18 |
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2 | [be] [prep] four years ' duration | 18 |
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3 | [be] [prep] four years ' duration | 18 |
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4 | [be] of four years ' duration | 17 |
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5 | is [prep] four years ' duration | 15 |
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6 | [is] [prep] four years ' duration | 15 |
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