| throughout history | 4 | temporal |
| for the cauldrons | 2 | transitive-object |
| plant → be used for → fuel | 16 |
| plant → be used as → fuel | 10 |
| plant → be used to produce → fuel | 3 |
| negative | neutral | positive |
| 0.106 | 0.644 | 0.250 |
| Raw frequency | 29 |
| Normalized frequency | 0.375 |
| Modifier score | 0.500 |
| Perplexity | 64.693 |