| very | 7 | degree |
| to determine using standard techniques | 3 | cause |
| hydrogen → be → difficult | 11 |
| hydrogen → be → hard | 8 |
| hydrogen → be difficult to → handle | 4 |
| hydrogen → be → tricky | 3 |
| negative | neutral | positive |
| 0.402 | 0.449 | 0.149 |
| Raw frequency | 26 |
| Normalized frequency | 0.401 |
| Modifier score | 0.500 |
| Perplexity | 66.451 |