| except for a rubber gasket | 3 | other |
| usually | 2 | temporal |
| valve → be made of → metal | 13 |
| valve → be → metal | 5 |
| valve → have → metal | 3 |
| negative | neutral | positive |
| 0.144 | 0.723 | 0.132 |
| Raw frequency | 21 |
| Normalized frequency | 0.293 |
| Modifier score | 0.700 |
| Perplexity | 81.532 |