C12313211232233312111111312111133133313331323133323232322221212131   >>    C1231321123223331211111131211113313331333132313332323232222121213   <<    C12313211232233312111111312111133133313331323133323232322221212133   >>      C12313211232233312111111312111133133313331323133323232322221212132   >>