| letter → IsA → official document | 0.56 | |
| letter → IsA → document | 0.54 | |
| letter → IsA → functional document | 0.45 | |
| letter → IsA → practical document | 0.44 | |
| letter → IsA → legal document | 0.42 | |
| letter → IsA → non-binding document | 0.40 | |
| letter → IsA → on letter paper | 0.38 | |
| letter → IsA → important document | 0.35 |