| to penetrate the skin | 4 | purpose |
| very | 3 | degree |
| historically | 2 | temporal |
| vitamin c → be → tricky | 8 |
| vitamin c → be → difficult | 3 |
| vitamin c → be → hard | 3 |
| negative | neutral | positive |
| 0.431 | 0.406 | 0.164 |
| Raw frequency | 14 |
| Normalized frequency | 0.262 |
| Modifier score | 0.500 |
| Perplexity | 57.120 |