C11112331333132311331333133112111133132313232233132313233112312121   >>    C1111233133313231133133313311211113313231323223313231323311231212   <<    C11112331333132311331333133112111133132313232233132313233112312123   >>      C11112331333132311331333133112111133132313232233132313233112312122   >>