| sometimes | 8 | degree |
| in fresh water | 4 | location |
| in preventing the microcracks | 4 | purpose |
| friction → be → useful | 20 |
| friction → be → helpful | 10 |
| friction → be → effective | 4 |
| negative | neutral | positive |
| 0.055 | 0.489 | 0.456 |
| Raw frequency | 34 |
| Normalized frequency | 0.676 |
| Modifier score | 0.400 |
| Perplexity | 279.025 |