| to ensure | 8 | purpose |
| in many countries | 5 | location |
| under the existing legislation | 3 | other |
| school → have → duty | 108 |
| school → have → the duty | 11 |
| school → require → the duty | 4 |
| negative | neutral | positive |
| 0.211 | 0.626 | 0.163 |
| Raw frequency | 123 |
| Normalized frequency | 0.567 |
| Modifier score | 1.000 |
| Perplexity | 38.644 |