| at the front | 4 | location |
| for developing the power | 4 | purpose |
| during this time period | 2 | temporal |
| aircraft → have → engine | 21 |
| aircraft → use → engine | 7 |
| aircraft → be → engine | 5 |
| aircraft → run → engine | 4 |
| negative | neutral | positive |
| 0.178 | 0.697 | 0.125 |
| Raw frequency | 37 |
| Normalized frequency | 0.464 |
| Modifier score | 0.800 |
| Perplexity | 245.309 |