Mastery ~10 min · ~0 min remaining
Mastery test
Demonstrate mastery of selections, components, and region auditing.
Mastery assessment
Show that you can do it without hints
You need at least 80% and every critical check correct. You can retry without a limit; each attempt gives you a focused review path.
Competency
Create and audit regions without relying on fragile identifiers.
Expected evidence
n_overlap=0, n_restored=n_nodes and passes=1.
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