| from natural gas | 20 | other |
| commercially | 6 | manner |
| more efficiently than other elements | 5 | manner |
| helium → be → extracted | 21 |
| helium → be → obtained | 5 |
| helium → be extracted through → method | 5 |
| negative | neutral | positive |
| 0.104 | 0.818 | 0.078 |
| Raw frequency | 31 |
| Normalized frequency | 0.738 |
| Modifier score | 0.914 |
| Perplexity | 176.327 |