Reference fixture — not teaching material
This lesson exists to exercise the platform. It was not written by a subject-matter expert and has not been reviewed by one. Do not study from it.
When it doesn’t balance
By the end: Apply the divide-by-9 and divide-by-2 checks to locate an error.
Not yet written
This lesson is planned and its objective is set, but the content has not been authored yet. The course page shows the full structure.