| easily | 5 | manner |
| properly | 4 | manner |
| regularly | 3 | degree |
| valve → be → cleaned | 47 |
| valve → need → cleaning | 4 |
| valve → be → washed | 4 |
| negative | neutral | positive |
| 0.236 | 0.586 | 0.178 |
| Raw frequency | 55 |
| Normalized frequency | 0.437 |
| Modifier score | 0.675 |
| Perplexity | 403.932 |