| Typicality: | 0.346 |
| Saliency: | 0.225 |
| for water purification | 2 | purpose |
| lecture → present → challenge | 8 |
| lecture → addresss → challenge | 3 |
| lecture → address → the challenge | 3 |
| negative | neutral | positive |
| 0.042 | 0.555 | 0.403 |
| Raw frequency | 14 |
| Normalized frequency | 0.225 |
| Modifier score | 0.500 |
| Perplexity | 167.417 |