{"id":"strobogrammatic-center-self-symmetric","text":"For odd-length strings, the `left <= right` loop condition forces the center digit to be checked against its own rotation, so only 0, 1, and 8 are valid center digits","truth_value":"IN","source":"entries/2026/06/06/strobogrammatic-number-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"strobogrammatic-center-self-symmetric","truth_value":"IN","reason":"premise"}]}}