| thoroughly | 27 | manner |
| rigorously | 11 | manner |
| before being licensed for use | 11 | temporal |
| vaccine → be → tested | 280 |
| vaccine → be tested → effective | 7 |
| vaccine → be used in → test | 5 |
| vaccine → be tested → available | 4 |
| vaccine → be tested before → use | 3 |
| vaccine → be tested for → effect | 3 |
| negative | neutral | positive |
| 0.229 | 0.615 | 0.156 |
| Raw frequency | 302 |
| Normalized frequency | 0.628 |
| Modifier score | 0.832 |
| Perplexity | 111.532 |