| often | 3 | degree |
| to use these online booking websites | 3 | purpose |
| for couchettes | 2 | purpose |
| traveler → pay → extra | 10 |
| traveler → pay → additional fee | 3 |
| negative | neutral | positive |
| 0.283 | 0.635 | 0.082 |
| Raw frequency | 13 |
| Normalized frequency | 0.325 |
| Modifier score | 0.750 |
| Perplexity | 75.663 |