C12313211232233312111111312111133133313331323133323232322132233211   >>    C1231321123223331211111131211113313331333132313332323232213223321   <<    C12313211232233312111111312111133133313331323133323232322132233213   >>      C12313211232233312111111312111133133313331323133323232322132233212   >>