| from a hot tube ignition | 5 | cause |
| during the early 1940s | 3 | temporal |
| successfully | 2 | manner |
| engine → be → converted | 46 |
| engine → be used for → conversion | 5 |
| negative | neutral | positive |
| 0.099 | 0.751 | 0.150 |
| Raw frequency | 51 |
| Normalized frequency | 0.458 |
| Modifier score | 0.792 |
| Perplexity | 486.793 |