| Typicality: | 0.373 |
| Saliency: | 0.288 |
| for learning development | 12 | purpose |
| in the 21 st century | 2 | temporal |
| concept → be → indispensable | 16 |
| concept → remain → indispensable | 3 |
| negative | neutral | positive |
| 0.086 | 0.617 | 0.297 |
| Raw frequency | 19 |
| Normalized frequency | 0.288 |
| Modifier score | 0.500 |
| Perplexity | 67.238 |