| in order to burn | 14 | purpose |
| in case | 2 | temporal |
| to purify materials | 2 | purpose |
| fire → need → heat | 69 |
| fire → require → heat | 28 |
| fire → require → a heat source | 4 |
| negative | neutral | positive |
| 0.265 | 0.661 | 0.074 |
| Raw frequency | 101 |
| Normalized frequency | 0.488 |
| Modifier score | 1.000 |
| Perplexity | 388.920 |