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rear-front rear-front+1 (rear-front+N)mod N (rear-front+N+1)mod N
rear-front rear-front+1 (rear-front+mod N (rear-front+N+1)mod N
rear mod n=front (front mod n)+1=real. (rear mod n)-1=front (rear mod n)+1=from
rear mod n=front (front mod n)+1=real. (rear mod n)-1=front (rear mod n)+1=from