| in order to promote their professional progress | 50 | purpose |
| because of safety | 45 | cause |
| because of regulatory | 25 | cause |
| change → be → required | 1991 |
| change → be → require | 7 |
| negative | neutral | positive |
| 0.144 | 0.722 | 0.134 |
| Raw frequency | 1998 |
| Normalized frequency | 0.736 |
| Modifier score | 0.196 |
| Perplexity | 27.993 |