{"id":"ugly-number-zero-guard","text":"`is_ugly(0)` returns `False` and never enters the division loop; without the `n <= 0` guard, `0 % 2 == 0` would loop forever","truth_value":"IN","source":"entries/2026/06/06/ugly-number-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"ugly-number-zero-guard","truth_value":"IN","reason":"premise"}]}}