{"id":"iterates-only-c1-keys","text":"`countWords` only iterates over `c1`'s keys, never `c2`'s — words exclusive to `words2` are never examined, which is correct since common words must appear in both arrays.","truth_value":"IN","source":"entries/2026/06/06/count-common-words-with-one-occurrence-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"iterates-only-c1-keys","truth_value":"IN","reason":"premise"}]}}