| very | 17 | degree |
| like any other filtration system | 7 | other |
| over time | 4 | temporal |
| duct → be → dirty | 62 |
| duct → get → dirty | 15 |
| duct → become → dirty | 3 |
| negative | neutral | positive |
| 0.769 | 0.198 | 0.033 |
| Raw frequency | 80 |
| Normalized frequency | 0.621 |
| Modifier score | 0.500 |
| Perplexity | 218.659 |