{"id":"destcity-empty-input-guard","text":"destCity raises ValueError on empty input; all other preconditions (valid path structure, linear chain) are trusted from the problem statement without validation.","truth_value":"IN","source":"entries/2026/06/06/destination-city-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"destcity-empty-input-guard","truth_value":"IN","reason":"premise"}]}}