| from the fertilization of agriculture | 5 | other |
| from a marine source | 4 | other |
| from fossils | 4 | other |
| gas → be → derived | 22 |
| gas → be → based | 3 |
| negative | neutral | positive |
| 0.198 | 0.737 | 0.065 |
| Raw frequency | 25 |
| Normalized frequency | 0.381 |
| Modifier score | 0.925 |
| Perplexity | 429.354 |