| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] difficult and | 38 |
|
| 2 | is [adv] difficult and | 38 |
|
| 3 | is very difficult and | 10 |
|
| 4 | is extremely difficult and | 5 |
|
| 5 | is both difficult and | 5 |
|
| 6 | is more difficult and | 5 |
|
