| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | on [adv] long | 14 |
|
| 2 | on [Wh adv] long | 9 |
|
| 3 | on how long | 9 |
|
| 4 | on how long | 9 |
|
| 5 | on [adv] long | 5 |
|
