| with robust control | 5 | other |
| worldwide | 4 | location |
| typically | 2 | degree |
| problem → be related to → stability | 14 |
| problem → be → stability | 14 |
| problem → relate to → stability | 8 |
| problem → be associated with → stability | 6 |
| problem → be → the stability | 3 |
| problem → involve → stability | 3 |
| problem → include → stability | 3 |
| negative | neutral | positive |
| 0.360 | 0.462 | 0.178 |
| Raw frequency | 51 |
| Normalized frequency | 0.334 |
| Modifier score | 0.800 |
| Perplexity | 71.726 |