C2313111122233131121133132311113313223313231333132333132313232212121   >>    C231311112223313112113313231111331322331323133313233313231323221212   <<    C2313111122233131121133132311113313223313231333132333132313232212123   >>      C2313111122233131121133132311113313223313231333132333132313232212122   >>