| in order to reduce corrosion of the systems | 5 | purpose |
| deliberately | 2 | manner |
| ammonia → be → added | 27 |
| ammonia → be in → addition | 3 |
| ammonia → be → introduced | 3 |
| negative | neutral | positive |
| 0.314 | 0.640 | 0.046 |
| Raw frequency | 33 |
| Normalized frequency | 0.538 |
| Modifier score | 0.600 |
| Perplexity | 49.951 |