| alternatively | 6 | degree |
| fully | 6 | degree |
| by using natural materials | 5 | manner |
| heat → be → employed | 39 |
| heat → be → utilized | 34 |
| heat → be → utilised | 7 |
| heat → be → exploited | 6 |
| negative | neutral | positive |
| 0.221 | 0.609 | 0.170 |
| Raw frequency | 86 |
| Normalized frequency | 0.562 |
| Modifier score | 0.000 |
| Perplexity | 338.411 |