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Anonymous
group A has 5 people group B has 7 people. when group A goes to the right all 5 cuts match up to 5 people, but when group B slides to the left, only 6 people match up which means an extra person (the whole person up top) has no match and therefor is the 13th person. the person who group B doesnt match with is the very first one in the bottom left corner.
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