{"id":"palindrome-perm-empty-string-true","text":"An empty string input returns `True` (zero odd counts <= 1)","truth_value":"IN","source":"entries/2026/06/06/palindrome-permutation-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":["edge-case-inputs-crash-free"],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"palindrome-perm-empty-string-true","truth_value":"IN","reason":"premise"}]}}