| # Dataset splits | |
| - Train: `easy/`, `medium/`, and `hard/` at this dataset root; 1000 cases each. | |
| - IID validation: `validation/`; 25 cases per difficulty and 75 total. | |
| - Fixed OOD challenge: `ood/`; one original Task 3 example per difficulty and 3 total. | |
| - Train master seed: `20260808`. | |
| - IID validation master seed: `520260808`. | |
| - IID validation excludes all 3000 train seeds and all 3000 train canonical arrangement signatures. | |