| naturally | 9 | manner |
| often | 3 | temporal |
| according to the report | 2 | other |
| fluoride → be found in → rock | 18 |
| fluoride → occur in → rock | 8 |
| negative | neutral | positive |
| 0.041 | 0.786 | 0.172 |
| Raw frequency | 26 |
| Normalized frequency | 0.432 |
| Modifier score | 0.767 |
| Perplexity | 62.339 |