| in protecting the traction motor | 6 | purpose |
| relay → be → important | 5 |
| relay → play → important role | 4 |
| relay → be → essential | 4 |
| negative | neutral | positive |
| 0.081 | 0.625 | 0.294 |
| Raw frequency | 13 |
| Normalized frequency | 0.332 |
| Modifier score | 0.500 |
| Perplexity | 97.166 |