| despite the challenges | 9 | other |
| too long | 6 | temporal |
| in their origins | 3 | temporal |
| year → be → period | 39 |
| year → be → the period | 25 |
| year → be followed by → period | 3 |
| negative | neutral | positive |
| 0.123 | 0.708 | 0.169 |
| Raw frequency | 67 |
| Normalized frequency | 0.511 |
| Modifier score | 0.475 |
| Perplexity | 297.115 |