| by itself | 5 | manner |
| in the presence of oxygen | 4 | other |
| methane → be → colorless | 20 |
| methane → be → colourless | 8 |
| methane → be → colorless gas | 4 |
| methane → be → colourless gas | 3 |
| methane → be → colourless, odourless gas | 3 |
| negative | neutral | positive |
| 0.598 | 0.346 | 0.055 |
| Raw frequency | 38 |
| Normalized frequency | 0.538 |
| Modifier score | 0.500 |
| Perplexity | 50.937 |