No | Pattern | Freq | Relations |
---|---|---|---|
1 | can [be] [vb pp] back to | 84 |
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2 | can [be] [verb] back to | 84 |
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3 | can [be] [verb] back to | 84 |
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4 | can be [verb] back to | 84 |
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5 | can [be] traced back to | 70 |
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6 | can [be] trace back to | 70 |
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