| to keeping homes | 24 | purpose |
| for all these reasons | 6 | cause |
| for any manufacturing plant | 4 | other |
| boiler → be → essential | 36 |
| boiler → be → required | 13 |
| boiler → be → necessary | 7 |
| boiler → be → necessity | 4 |
| boiler → be → must | 3 |
| negative | neutral | positive |
| 0.124 | 0.459 | 0.417 |
| Raw frequency | 63 |
| Normalized frequency | 0.624 |
| Modifier score | 0.725 |
| Perplexity | 454.775 |