| than these present | 4 | other |
| properly | 3 | manner |
| furnace → have → venting | 11 |
| furnace → be → vented | 9 |
| furnace → be → ventilated | 3 |
| negative | neutral | positive |
| 0.215 | 0.726 | 0.058 |
| Raw frequency | 23 |
| Normalized frequency | 0.440 |
| Modifier score | 1.000 |
| Perplexity | 212.765 |