| very | 27 | degree |
| for clean water | 15 | purpose |
| for human survival | 11 | purpose |
| wetland → be → important | 100 |
| wetland → be → vital | 50 |
| wetland → be → critical | 42 |
| wetland → be → essential | 36 |
| wetland → be → crucial | 16 |
| wetland → be → key | 4 |
| wetland → be important to → human | 3 |
| negative | neutral | positive |
| 0.069 | 0.500 | 0.430 |
| Raw frequency | 251 |
| Normalized frequency | 1.000 |
| Modifier score | 0.700 |
| Perplexity | 72.242 |