| from bacteria | 9 | cause |
| during degradation | 6 | temporal |
| from everyday metabolic activities | 4 | other |
| acid → be → formed | 81 |
| acid → be formed in → the atmosphere | 3 |
| negative | neutral | positive |
| 0.370 | 0.559 | 0.071 |
| Raw frequency | 84 |
| Normalized frequency | 0.787 |
| Modifier score | 0.400 |
| Perplexity | 269.474 |