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There is a function call in ok.py called check. This is a pretty generic name, and students call temporary variables check all the time, which causes name space collisions and bad things to happen.

notebook.py has multiple function calls that try to deal with this problem, but I don't think they work. Instead of actually calling these functions, there are two lines of code that cause the autograder to just error out of any submission that has a function or variable named check.

if find_check_assignment(tree) or find_check_definition(tree):
        # an empty global_env will fail all the tests
        return global_env