C11112331333132311331333133112111133132313232233133313231312121   >>    C1111233133313231133133313311211113313231323223313331323131212   <<    C11112331333132311331333133112111133132313232233133313231312123   >>      C11112331333132311331333133112111133132313232233133313231312122   >>