| in order to reach this purity | 3 | purpose |
| zinc → be → refined | 8 |
| zinc → be refined by → final extraction | 8 |
| zinc → be → processed | 4 |
| negative | neutral | positive |
| 0.063 | 0.851 | 0.086 |
| Raw frequency | 20 |
| Normalized frequency | 0.354 |
| Modifier score | 0.500 |
| Perplexity | 305.562 |