| in the united states | 15 | location |
| as being needing one annual service | 2 | other |
| boiler → be → sold | 5 |
| boiler → be sold to → its customers | 5 |
| negative | neutral | positive |
| 0.189 | 0.748 | 0.062 |
| Raw frequency | 10 |
| Normalized frequency | 0.247 |
| Modifier score | 0.500 |
| Perplexity | 329.380 |