| during the backwash phase | 12 | temporal |
| from the reaction solution | 11 | other |
| from the skin | 10 | location |
| impurity → be → removed | 215 |
| impurity → be removed in → advance | 6 |
| negative | neutral | positive |
| 0.183 | 0.671 | 0.146 |
| Raw frequency | 221 |
| Normalized frequency | 1.000 |
| Modifier score | 0.906 |
| Perplexity | 91.495 |