No | Pattern | Freq | Relations |
---|---|---|---|
1 | [num] year ' duration | 70 |
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2 | [num] years ['s] duration | 70 |
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3 | four year ['s] duration | 28 |
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4 | three year ['s] duration | 25 |
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5 | two year ['s] duration | 7 |
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6 | [num] year ['s] duration | 6 |
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7 | [num] year 's duration | 6 |
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8 | one year ['s] duration | 5 |
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