| to national security | 6 | transitive-object |
| to cleaning up hanoi’s air | 6 | purpose |
| in preserving body functions | 3 | purpose |
| ban → be → important | 13 |
| ban → be → essential | 11 |
| ban → be → critical | 7 |
| ban → be → vital | 5 |
| ban → be → crucial | 4 |
| negative | neutral | positive |
| 0.251 | 0.575 | 0.174 |
| Raw frequency | 40 |
| Normalized frequency | 0.434 |
| Modifier score | 0.500 |
| Perplexity | 191.226 |