Without giving away the answer, it is more this rather than what is in the solution, no?
PS: I will delete your answer after reading it, if you wish.
Actually not because we don’t ask for the rate but the increase in term of a score. We are going to reformulate because you are the third person reporting an issue regarding the formulation:
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It is fixed. See discussion there: https://gitlab.inria.fr/learninglab/mooc-scikit-learn/mooc-scikit-learn-coordination/-/commit/e5783eaec576d6d8edb02f947cecad3c42275be5