| underground | 5 | location |
| usually | 5 | degree |
| each year | 4 | temporal |
| nest → be → built | 24 |
| nest → be → constructed | 17 |
| nest → be → made | 11 |
| nest → be → formed | 7 |
| negative | neutral | positive |
| 0.249 | 0.683 | 0.069 |
| Raw frequency | 59 |
| Normalized frequency | 0.891 |
| Modifier score | 0.750 |
| Perplexity | 219.454 |