No | Pattern | Freq | Relations |
---|---|---|---|
1 | research has be [vb pp] on the | 8 |
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2 | research [vb -s] been [vb pp] on the | 8 |
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3 | research [vb -s] be [vb pp] on the | 8 |
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4 | research [vb -s] be done on the | 5 |
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