| to make energy | 7 | purpose |
| at a rate | 5 | manner |
| since the late 1800s | 4 | temporal |
| human → burn → coal | 55 |
| human → start burning → coal | 4 |
| negative | neutral | positive |
| 0.568 | 0.404 | 0.028 |
| Raw frequency | 59 |
| Normalized frequency | 0.589 |
| Modifier score | 0.900 |
| Perplexity | 50.448 |