| in color | 6 | other |
| in black and grey subjects | 5 | location |
| depending on coat color of toes | 5 | other |
| nail → be → black | 73 |
| nail → appear → black | 6 |
| nail → look → black | 3 |
| negative | neutral | positive |
| 0.333 | 0.592 | 0.074 |
| Raw frequency | 82 |
| Normalized frequency | 0.590 |
| Modifier score | 0.875 |
| Perplexity | 200.812 |