| to prevent back flow of blood | 3 | purpose |
| between ventricles | 3 | location |
| between its chambers | 2 | location |
| heart → have → valve | 26 |
| heart → contain → valve | 6 |
| heart → valve within → the patient | 3 |
| negative | neutral | positive |
| 0.073 | 0.818 | 0.108 |
| Raw frequency | 35 |
| Normalized frequency | 0.360 |
| Modifier score | 0.500 |
| Perplexity | 370.237 |