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1,9,8,0 - One number is correct and well placed.
6,5,4,1 - Nothing is correct.
7,3,8,6 - Two numbers are correct, but only one is well placed.
4,6,5,7 - One number is correct and wrongly placed.
9,8,1,2 - Two numbers are correct and wrongly placed.
7,9,8,0 - Two numbers are correct and well placed.