| from residual material | 9 | other |
| from leaks | 8 | other |
| for a period of 10 years | 7 | temporal |
| tank → be → free | 68 |
| tank → shown to be → free | 4 |
| tank → look → free | 3 |
| negative | neutral | positive |
| 0.068 | 0.527 | 0.405 |
| Raw frequency | 75 |
| Normalized frequency | 0.518 |
| Modifier score | 1.000 |
| Perplexity | 389.317 |