| very | 6 | degree |
| for your house | 6 | transitive-object |
| for keeping your plumbing system | 5 | purpose |
| drain → be → important | 18 |
| drain → be → essential | 8 |
| drain → be → vital | 3 |
| negative | neutral | positive |
| 0.157 | 0.574 | 0.269 |
| Raw frequency | 29 |
| Normalized frequency | 0.410 |
| Modifier score | 0.500 |
| Perplexity | 293.559 |