C21221212121211331313233313131133132333132313223313231323221123313231211   >>    C2122121212121133131323331313113313233313231322331323132322112331323121   <<    C21221212121211331313233313131133132333132313223313231323221123313231213   >>      C21221212121211331313233313131133132333132313223313231323221123313231212   >>