| in order to strengthen the valve seat | 7 | purpose |
| further | 3 | degree |
| more so | 3 | degree |
| metal → be → hardened | 15 |
| metal → become → hardened | 7 |
| negative | neutral | positive |
| 0.168 | 0.687 | 0.146 |
| Raw frequency | 22 |
| Normalized frequency | 0.366 |
| Modifier score | 0.500 |
| Perplexity | 273.077 |