| only twice | 10 | temporal |
| from the air | 3 | location |
| between 6:30 a.m. | 2 | temporal |
| boat → be → spotted | 21 |
| boat → be → sighted | 11 |
| boat → be → detected | 5 |
| negative | neutral | positive |
| 0.170 | 0.762 | 0.068 |
| Raw frequency | 37 |
| Normalized frequency | 0.408 |
| Modifier score | 0.000 |
| Perplexity | 228.035 |