SPLITS.md

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.