| to follow walls | 6 | purpose |
| for data | 2 | purpose |
| to sense presence of human beings | 2 | purpose |
| robot → use → sonar | 18 |
| robot → have → sonar | 4 |
| robot → be equipped with → sonar | 3 |
| negative | neutral | positive |
| 0.069 | 0.721 | 0.210 |
| Raw frequency | 25 |
| Normalized frequency | 0.401 |
| Modifier score | 0.575 |
| Perplexity | 311.627 |