| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] not difficult [to-vb] [conj] [art] | 6 |
|
| 2 | be not difficult [to-vb] [conj] [art] | 6 |
|
| 3 | [is] not difficult [to-vb] [conj] [art] | 5 |
|
| 4 | is not difficult [to-vb] [conj] [art] | 5 |
|
