C11112331312111112111133133313331333133313123313331333131231212111133112322121   >>    C1111233131211111211113313331333133313331312331333133313123121211113311232212   <<    C11112331312111112111133133313331333133313123313331333131231212111133112322123   >>      C11112331312111112111133133313331333133313123313331333131231212111133112322122   >>