| at concentrations | 9 | location |
| very | 5 | degree |
| generally | 3 | degree |
| iron → be → brittle | 15 |
| iron → become → brittle | 7 |
| iron → be → brittle, hard substance | 5 |
| negative | neutral | positive |
| 0.421 | 0.508 | 0.071 |
| Raw frequency | 27 |
| Normalized frequency | 0.404 |
| Modifier score | 0.500 |
| Perplexity | 365.934 |