| once a month | 6 | temporal |
| at atmospheric pressure | 3 | other |
| from coal-fired boilers | 2 | other |
| engine → be in → steam | 11 |
| engine → run on → steam | 9 |
| engine → use → steam | 7 |
| engine → be → steam | 6 |
| engine → work with → steam | 3 |
| negative | neutral | positive |
| 0.175 | 0.612 | 0.213 |
| Raw frequency | 36 |
| Normalized frequency | 0.402 |
| Modifier score | 0.500 |
| Perplexity | 332.967 |