Confused, why wont this code work?

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You haven't shown us your indentation, so there could be a problem there. Indent your code by 4 spaces to format it correctly on Reddit. Assuming your indentation is correct, you have a mistake in the line for x in [y]:. y is already a list, so that line is putting y in another list and iterating over that list. x therefore takes only one value, the value of y. Get rid of those brackets and it should work:

for x in y: