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    This comment is hidden because it contains spoiler information about the solution

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    I really don't understand the description.

    coffees = [20,5] -> 32

    Cust 1 20 = 20

    Cust 2 20+2+5 = 27 not 32

    or

    Cust 1 5 = 5

    Cust 2 5+2+20 = 27 still not 32

    Must be miss understanding something, or it's not clear, I'm missing a calculation or magic number?