| very | 14 | degree |
| because of history | 7 | cause |
| to keep warm | 6 | purpose |
| property → be → difficult | 51 |
| property → be → hard | 25 |
| property → become → difficult | 3 |
| negative | neutral | positive |
| 0.426 | 0.433 | 0.141 |
| Raw frequency | 79 |
| Normalized frequency | 0.414 |
| Modifier score | 0.600 |
| Perplexity | 133.250 |