| from feedstock | 6 | other |
| from crude c4 | 3 | other |
| from c4 hydrocarbons | 2 | other |
| butadiene → be → extracted | 6 |
| butadiene → be → obtained | 4 |
| negative | neutral | positive |
| 0.106 | 0.837 | 0.058 |
| Raw frequency | 10 |
| Normalized frequency | 1.000 |
| Modifier score | 0.500 |
| Perplexity | 159.491 |