C111123313331323113313331333133313331122112312111133132233133313232212121   >>    C11112331333132311331333133313331333112211231211113313223313331323221212   <<    C111123313331323113313331333133313331122112312111133132233133313232212123   >>      C111123313331323113313331333133313331122112312111133132233133313232212122   >>