| preferably | 2 | degree |
| by purging air | 2 | manner |
| for the initiative | 2 | cause |
| balloon → be → tested | 13 |
| balloon → be used in → trial | 4 |
| negative | neutral | positive |
| 0.059 | 0.892 | 0.048 |
| Raw frequency | 17 |
| Normalized frequency | 0.276 |
| Modifier score | 1.000 |
| Perplexity | 286.380 |