| earlier | 3 | temporal |
| between strains | 2 | other |
| for a comprehensive review | 2 | purpose |
| mutation → be → discussed | 6 |
| mutation → be → noted | 5 |
| mutation → see → reference | 5 |
| mutation → be → mentioned | 4 |
| negative | neutral | positive |
| 0.347 | 0.597 | 0.056 |
| Raw frequency | 20 |
| Normalized frequency | 0.384 |
| Modifier score | 0.000 |
| Perplexity | 183.972 |