| in the earth's crust | 2 | location |
| totally | 2 | degree |
| fluoride → be → natural | 17 |
| fluoride → be → natural substance | 11 |
| fluoride → be → natural compound | 4 |
| negative | neutral | positive |
| 0.190 | 0.504 | 0.306 |
| Raw frequency | 32 |
| Normalized frequency | 0.474 |
| Modifier score | 0.500 |
| Perplexity | 31.038 |