{"id":"valid-palindrome-inner-loop-guards","text":"The inner skip loops re-check `left < right`, which prevents index-out-of-bounds on strings containing no alphanumeric characters.","truth_value":"IN","source":"entries/2026/06/06/valid-palindrome-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"valid-palindrome-inner-loop-guards","truth_value":"IN","reason":"premise"}]}}