| Share | Phrase |
| 39.82% | connective [connection] plumbing |
| 11.80% | plumbing connection |
| 11.26% | complex [difficulty] plumbing |
| 10.56% | associated [dependency] plumbing |
| 8.43% | appropriate [effectiveness] plumbing |
| 7.59% | require plumbing [perform operation] |
| 6.68% | external [location] plumbing |
| 3.82% | plumbing circuit |