| to be qualified | 9 | purpose |
| on using the devices | 6 | other |
| clearly | 5 | manner |
| driver → need → training | 19 |
| driver → need → additional training | 15 |
| driver → need → more training | 7 |
| driver → require → additional training | 6 |
| driver → require → training | 3 |
| driver → undergo → additional training | 3 |
| driver → need → extra training | 3 |
| negative | neutral | positive |
| 0.268 | 0.611 | 0.121 |
| Raw frequency | 56 |
| Normalized frequency | 0.460 |
| Modifier score | 0.800 |
| Perplexity | 72.239 |