| typically | 3 | degree |
| with zinc oxide | 2 | other |
| catalyst → be made of → copper | 14 |
| catalyst → contain → copper | 8 |
| catalyst → be made from → copper | 4 |
| catalyst → be based on → copper | 3 |
| catalyst → comprise → copper | 3 |
| negative | neutral | positive |
| 0.060 | 0.776 | 0.165 |
| Raw frequency | 32 |
| Normalized frequency | 0.553 |
| Modifier score | 0.900 |
| Perplexity | 243.871 |