| in lowering of biochemical oxygen demand | 4 | other |
| as hydrogen | 3 | other |
| due to the high content of color | 3 | cause |
| carbon → be → effective | 11 |
| carbon → be → more effective | 3 |
| carbon → be → the most effective | 3 |
| negative | neutral | positive |
| 0.057 | 0.493 | 0.449 |
| Raw frequency | 17 |
| Normalized frequency | 0.375 |
| Modifier score | 0.500 |
| Perplexity | 141.963 |