| based on the suspected fouling mechanisms | 9 | cause |
| carefully | 3 | manner |
| by using a search | 3 | manner |
| chemical → be → selected | 22 |
| chemical → be → chosen | 14 |
| negative | neutral | positive |
| 0.171 | 0.745 | 0.084 |
| Raw frequency | 36 |
| Normalized frequency | 0.413 |
| Modifier score | 0.800 |
| Perplexity | 167.817 |