{"id":"set-mismatch-return-order","text":"`findErrorNums` returns `[duplicate, missing]`, matching the LeetCode 645 contract — the duplicate is always first.","truth_value":"IN","source":"entries/2026/06/06/set-mismatch-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"set-mismatch-return-order","truth_value":"IN","reason":"premise"}]}}