| very | 12 | degree |
| in today’s world | 5 | location |
| hardly | 2 | degree |
| fluoride → be → difficult | 7 |
| fluoride → be difficult to → remove | 5 |
| fluoride → be → hard | 5 |
| negative | neutral | positive |
| 0.678 | 0.258 | 0.064 |
| Raw frequency | 17 |
| Normalized frequency | 0.347 |
| Modifier score | 0.100 |
| Perplexity | 60.902 |