| before installing the burner | 4 | temporal |
| very | 3 | degree |
| boiler → be → clean | 17 |
| boiler → be kept → clean | 3 |
| boiler → remain → clean | 3 |
| negative | neutral | positive |
| 0.057 | 0.591 | 0.352 |
| Raw frequency | 23 |
| Normalized frequency | 0.417 |
| Modifier score | 0.500 |
| Perplexity | 283.312 |