| in knobby | 3 | location |
| depending on the ecotype | 3 | other |
| with concentric light | 2 | other |
| shell → be → dark | 7 |
| shell → become → dark | 3 |
| negative | neutral | positive |
| 0.290 | 0.539 | 0.172 |
| Raw frequency | 10 |
| Normalized frequency | 0.314 |
| Modifier score | 0.500 |
| Perplexity | 291.929 |