C1111233131211111211113313331333133313232313331333133313331311321111222233121   >>    C111123313121111121111331333133313331323231333133313331333131132111122223312   <<    C1111233131211111211113313331333133313232313331333133313331311321111222233123   >>      C1111233131211111211113313331333133313232313331333133313331311321111222233122   >>