{"id":"empty-string-returns-zero","text":"`count_letters(\"\")` returns 0 without any special-case code, handled implicitly by the outer while-loop guard","truth_value":"IN","source":"entries/2026/06/06/count-substrings-with-only-one-distinct-letter-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"empty-string-returns-zero","truth_value":"IN","reason":"premise"}]}}