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def display_data():
    print("There are", len(Comps), "pupils in the system so far.")

    for index in enumerate(Comps):
        lst = Attempts[index]
        for i, num in enumerate(lst):
            if num == -1:
                lst[i] = "X"
        lst = map(str, lst)
        print(name + ", " + ", ".join(lst))