| under this severe service conditions | 3 | other |
| normally | 2 | degree |
| valve → have → function | 9 |
| valve → fulfil → its function | 3 |
| valve → perform → its function | 3 |
| negative | neutral | positive |
| 0.126 | 0.682 | 0.191 |
| Raw frequency | 15 |
| Normalized frequency | 0.242 |
| Modifier score | 0.900 |
| Perplexity | 239.525 |