| every year | 6 | temporal |
| during the old days | 5 | temporal |
| annually | 4 | temporal |
| furnace → be → checked | 26 |
| furnace → checked by → professional | 10 |
| furnace → be checked by → professional | 4 |
| negative | neutral | positive |
| 0.207 | 0.690 | 0.103 |
| Raw frequency | 40 |
| Normalized frequency | 0.560 |
| Modifier score | 0.900 |
| Perplexity | 205.401 |