| # TT638D Four Function Targeted Generalization | |
| Goal: | |
| Fix TT638C dense failures before any dyadic/Mercy proof. | |
| TT638C evidence: | |
| - seen failed on uppercase canonical prompts for SUBTRACT, MULTIPLY, DIVIDE | |
| - heldout failed on divide phrasing: `Create divide so it computes a over b.` | |
| TT638D changes: | |
| - balanced uppercase function-template coverage across ADD/SUBTRACT/MULTIPLY/DIVIDE | |
| - explicit regression gate for TT638C failed prompts | |
| - targeted divide `a over b` coverage | |
| - fresh heldout prompts not used as train rows | |