| from metal penetration | 4 | cause |
| occasionally | 2 | degree |
| with an anti | 2 | other |
| iron → be → cleaned | 17 |
| iron → be → self-cleaning | 3 |
| negative | neutral | positive |
| 0.237 | 0.654 | 0.109 |
| Raw frequency | 20 |
| Normalized frequency | 0.348 |
| Modifier score | 0.300 |
| Perplexity | 418.738 |