{"id":"check-double-even-guard","text":"The `x % 2 == 0` guard is required for correctness; without it, odd numbers would falsely match via integer division truncation (e.g., `7 // 2 = 3`)","truth_value":"IN","source":"entries/2026/06/06/check-if-n-and-its-double-exist-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"check-double-even-guard","truth_value":"IN","reason":"premise"}]}}