| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | and how [adj] | 1412 |
|
| 2 | and how [adj] | 562 |
|
| 3 | and [adv] difficult | 190 |
|
| 4 | [coord] how difficult | 22 |
|
| 5 | [conj] how difficult | 22 |
|
| 6 | and how difficult | 16 |
|
| 7 | and [Wh adv] difficult | 16 |
|
| 8 | and how difficult | 16 |
|
| 9 | and how difficult | 16 |
|
