| to enhance vigilance | 9 | purpose |
| at the end of the day | 8 | temporal |
| as a diuretic | 2 | manner |
| caffeine → can → act | 7 |
| caffeine → be → acts | 4 |
| caffeine → be → active | 4 |
| caffeine → be → act | 3 |
| caffeine → be at → work | 3 |
| negative | neutral | positive |
| 0.194 | 0.462 | 0.345 |
| Raw frequency | 21 |
| Normalized frequency | 0.324 |
| Modifier score | 0.500 |
| Perplexity | 159.747 |