{"id":"set-based-pangram-check","text":"The pangram solution uses `len(set(sentence)) == 26` as both necessary and sufficient, which is correct only under the invariant that input contains exclusively lowercase a–z characters.","truth_value":"IN","source":"entries/2026/06/06/check-if-the-sentence-is-pangram-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"set-based-pangram-check","truth_value":"IN","reason":"premise"}]}}