| over the mouth | 9 | location |
| with catheter | 2 | other |
| membrane → form → seal | 5 |
| membrane → seal → material | 5 |
| membrane → provide → seal | 4 |
| membrane → provide → sealing structure | 3 |
| negative | neutral | positive |
| 0.051 | 0.873 | 0.076 |
| Raw frequency | 17 |
| Normalized frequency | 0.328 |
| Modifier score | 0.500 |
| Perplexity | 226.423 |