| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [coord] how it [verb] | 8 |
|
| 2 | why [conj] how it [verb] | 8 |
|
| 3 | why [conj] how it [verb] | 8 |
|
| 4 | why and how it [verb] | 5 |
|
| 5 | why [conj] how it [vb past] | 5 |
|
| 6 | why and how it [verb] | 5 |
|
