| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should have no difficulty | 16 |
|
| 2 | should have no difficulty | 16 |
|
| 3 | should have [art] difficulty | 16 |
|
| 4 | should have [art] difficulty | 16 |
|
| 5 | should have [art] difficulty | 15 |
|
