| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] that [art] [adj] | 1531 |
|
| 2 | difficulty [is] that [art] | 35 |
|
| 3 | difficulty [is] that [adj] | 8 |
|
| 4 | difficulty that [art] [adj] | 7 |
|
| 5 | difficulty [is] [art] [adj] | 5 |
|
