C11112331333132311331333133112111133132313232233133313232211111   >>    C1111233133313231133133313311211113313231323223313331323221111   <<    C11112331333132311331333133112111133132313232233133313232211113   >>      C11112331333132311331333133112111133132313232233133313232211112   >>