{"id":"valid-parentheses-match-dict-dual-use","text":"The `match` dict serves both as a closer-detection set (`ch in match`) and as a closer-to-opener lookup, eliminating the need for a separate set or if-chain.","truth_value":"IN","source":"entries/2026/06/06/valid-parentheses-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"valid-parentheses-match-dict-dual-use","truth_value":"IN","reason":"premise"}]}}