No | Pattern | Freq | Relations |
---|---|---|---|
1 | it is often difficult [to-vb] | 59 | |
2 | it is often difficult [verb] | 59 | |
3 | it is often difficult [verb] | 59 | |
4 | it is often difficult to determine | 5 | |
5 | it is often difficult determine | 5 |
it is often difficult [verb] Next page
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