C11112331333132311331333132313331323133313232221233132313231211   >>    C1111233133313231133133313231333132313331323222123313231323121   <<    C11112331333132311331333132313331323133313232221233132313231213   >>      C11112331333132311331333132313331323133313232221233132313231212   >>