| very | 8 | degree |
| with time | 4 | cause |
| always | 4 | degree |
| mining → be → difficult | 37 |
| mining → become → difficult | 13 |
| mining → become → hard | 3 |
| negative | neutral | positive |
| 0.461 | 0.451 | 0.089 |
| Raw frequency | 53 |
| Normalized frequency | 0.607 |
| Modifier score | 0.667 |
| Perplexity | 118.036 |