C111123313331323113313331333133313331323132333133313311232213121   >>    C11112331333132311331333133313331333132313233313331331123221312   <<    C111123313331323113313331333133313331323132333133313311232213123   >>      C111123313331323113313331333133313331323132333133313311232213122   >>