Regifting Robin... WTF

This is absolutely nuts. Someone smart please tell me how this works!!

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Doing the math, subtracting the two digits from the original number, will always end up as a multiple of 9.

So check the boxes that are multiples of 9, the same item is listed in each.

See, they got me with the fact that the item switches up every time. I wasn’t looking with enough scrutiny to catch that.

My analytical/math skills stink!