| safely | 3 | manner |
| from continuous gas accumulations | 2 | other |
| really | 2 | degree |
| shale gas → be → produced | 12 |
| shale gas → be → extracted | 9 |
| shale gas → be → developed | 3 |
| negative | neutral | positive |
| 0.165 | 0.641 | 0.194 |
| Raw frequency | 24 |
| Normalized frequency | 1.000 |
| Modifier score | 0.900 |
| Perplexity | 62.555 |