| each time | 8 | temporal |
| after confirming successful cannulation | 4 | temporal |
| safely | 2 | manner |
| chest → be → opened | 58 |
| chest → be → open | 21 |
| negative | neutral | positive |
| 0.153 | 0.710 | 0.138 |
| Raw frequency | 79 |
| Normalized frequency | 0.861 |
| Modifier score | 0.500 |
| Perplexity | 167.546 |