| from ammonia | 11 | cause |
| from two raw materials | 9 | other |
| from carbon dioxide | 8 | other |
| urea → be → produced | 25 |
| urea → be → formed | 9 |
| urea → be → made | 6 |
| urea → be → manufactured | 5 |
| urea → be → synthesized | 4 |
| negative | neutral | positive |
| 0.221 | 0.722 | 0.058 |
| Raw frequency | 49 |
| Normalized frequency | 1.000 |
| Modifier score | 1.000 |
| Perplexity | 293.485 |