| Share | Phrase |
|---|
| 19.55% | recirculate back gas [perform operation] |
| 19.36% | tank [connection] recirculate back |
| 18.04% | inlet [connection] recirculate back |
| 16.96% | chamber [connection] recirculate back |
| 12.78% | reservoir [location] recirculate back |
| 10.15% | recirculate back fuel [perform operation] |
| 3.12% | recirculate back modal can |