| Share | Phrase |
|---|
| 33.51% | occur [location] travel down |
| 17.73% | travel down hill [perform operation] |
| 14.47% | vehicle [does] travel down |
| 9.50% | travel down to end |
| 8.71% | mixture [does] travel down |
| 8.31% | travel down tube [perform operation] |
| 4.01% | wheel [does] travel down |
| 3.72% | travel down line [perform operation] |