| anywhere | 5 | location |
| naturally | 3 | manner |
| in littleton wells | 3 | location |
| radon → can → occur | 5 |
| radon → be → a occurring | 3 |
| radon → be not → uncommon occurrence | 3 |
| negative | neutral | positive |
| 0.291 | 0.662 | 0.047 |
| Raw frequency | 11 |
| Normalized frequency | 0.260 |
| Modifier score | 0.500 |
| Perplexity | 179.440 |