C111123313331323113313331333133313331122112312111133133313331333131133311212121   >>    C11112331333132311331333133313331333112211231211113313331333133313113331121212   <<    C111123313331323113313331333133313331122112312111133133313331333131133311212123   >>      C111123313331323113313331333133313331122112312111133133313331333131133311212122   >>