| Share | Phrase |
|---|
| 20.85% | burn off soot [perform operation] |
| 9.88% | burn off vapor [perform operation] |
| 9.42% | insufficient to burn off |
| 8.07% | deposit [does] burn off |
| 7.96% | burn off emission [perform operation] |
| 7.84% | burn off co [perform operation] |
| 7.84% | burn off hc [perform operation] |
| 7.05% | burn off deposit [perform operation] |
| 5.70% | burn off particle [perform operation] |
| 5.11% | heat [does] burn off |
| 4.22% | burn off modal will |
| 3.03% | burn off oil [perform operation] |
| 2.96% | burn off gas [perform operation] |