{"id":"defaultdict-set-for-group-membership","text":"`countPoints` uses `defaultdict(set)` to accumulate colors per rod, which automatically deduplicates repeated color placements — a pattern also used in pangram-checking and consistent-string problems across the repo.","truth_value":"IN","source":"entries/2026/06/06/rings-and-rods-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"defaultdict-set-for-group-membership","truth_value":"IN","reason":"premise"}]}}