{"id":"middle-element-lo-le-hi","text":"The `lo <= hi` condition (not `lo < hi`) in `flipAndInvertImage` is critical: it ensures the center element of odd-length rows is inverted exactly once when `lo == hi`.","truth_value":"IN","source":"entries/2026/06/06/flipping-an-image-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"middle-element-lo-le-hi","truth_value":"IN","reason":"premise"}]}}