| Share | Phrase |
|---|
| 17.26% | ancillary [importance] duct |
| 12.10% | ancillary [importance] wall |
| 9.51% | ancillary [importance] system |
| 8.34% | ancillary [importance] conduit |
| 8.01% | ancillary [importance] switch |
| 7.22% | ancillary [importance] component |
| 6.49% | ancillary [importance] equipment |
| 5.55% | ancillary [importance] device |
| 5.39% | ancillary [importance] chamber |
| 4.89% | ancillary [importance] mechanism |
| 3.33% | ancillary [importance] reaction |
| 3.31% | ancillary [importance] circuit |
| 3.17% | ancillary [importance] element |
| 3.13% | ancillary [importance] tank |
| 2.25% | ancillary [importance] part |