{"id":"decode-message-first-occurrence-wins","text":"The substitution cipher is built by mapping each letter to its first occurrence position in the key; duplicate letters are skipped via a `not in table` guard, making the mapping order-dependent and deterministic.","truth_value":"IN","source":"entries/2026/06/06/decode-the-message-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"decode-message-first-occurrence-wins","truth_value":"IN","reason":"premise"}]}}