No | Pattern | Freq | Relations |
---|---|---|---|
1 | period [prep] [num] years [pron] | 10 |
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2 | period of [num] years [pron] | 10 |
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3 | period [prep] [num] years [pers pn] | 9 |
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4 | period [prep] [num] years it | 5 |
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5 | period [prep] [num] years it | 5 |
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