No | Pattern | Freq | Relations |
---|---|---|---|
1 | is difficult [verb] such [art] [noun] | 5 |
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2 | is difficult [verb] such [art] [noun] | 5 |
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3 | is difficult [verb] such [art] [noun sg] | 5 |
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4 | is difficult [to-vb] such [art] [noun] | 5 |
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