| usually | 5 | degree |
| in one of two oxidation states | 5 | location |
| iron → be → ferrous | 7 |
| iron → be present in → both the ferrous state | 4 |
| iron → be in → ferrous form | 4 |
| negative | neutral | positive |
| 0.123 | 0.807 | 0.069 |
| Raw frequency | 15 |
| Normalized frequency | 0.296 |
| Modifier score | 0.840 |
| Perplexity | 140.313 |