{"id":"confusing-number-rotate-dict-dual-purpose","text":"The `rotate` dict serves as both a validity whitelist (membership test for rotatable digits) and a transformation function (mapping each digit to its rotation), avoiding separate validation and transformation steps.","truth_value":"IN","source":"entries/2026/06/06/confusing-number-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"confusing-number-rotate-dict-dual-purpose","truth_value":"IN","reason":"premise"}]}}