| because of the low mortality rate | 4 | cause |
| typically | 3 | degree |
| without sufficient vertical and horizontal space | 2 | other |
| tank → be → crowded | 16 |
| negative | neutral | positive |
| 0.551 | 0.380 | 0.068 |
| Raw frequency | 16 |
| Normalized frequency | 0.269 |
| Modifier score | 0.933 |
| Perplexity | 289.914 |