| Typicality: | 0.494 |
| Saliency: | 0.370 |
| well | 14 | degree |
| for over a hundred years | 4 | temporal |
| extensively | 3 | degree |
| problem → be → researched | 64 |
| problem → be under → study | 5 |
| negative | neutral | positive |
| 0.224 | 0.616 | 0.160 |
| Raw frequency | 69 |
| Normalized frequency | 0.370 |
| Modifier score | 0.767 |
| Perplexity | 477.315 |