| mainly | 3 | degree |
| more than ammonia | 2 | other |
| urine → contain → urea | 17 |
| urine → consist of → urea | 13 |
| urine → be composed of → urea | 5 |
| urine → be → urea | 4 |
| negative | neutral | positive |
| 0.310 | 0.644 | 0.046 |
| Raw frequency | 39 |
| Normalized frequency | 0.602 |
| Modifier score | 0.943 |
| Perplexity | 152.622 |