{"id":"hashset-no-duplicates-invariant","text":"MyHashSet.add checks `key not in bucket` before appending, guaranteeing each key appears exactly once across the entire structure.","truth_value":"IN","source":"entries/2026/06/06/design-hashset-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"hashset-no-duplicates-invariant","truth_value":"IN","reason":"premise"}]}}