C111123313331323113313331333133313331122112312111133131133132313233213231211   >>    C11112331333132311331333133313331333112211231211113313113313231323321323121   <<    C111123313331323113313331333133313331122112312111133131133132313233213231213   >>      C111123313331323113313331333133313331122112312111133131133132313233213231212   >>