C12313211232233312111111312111133133313331323133313331122332321231212223221   >>    C1231321123223331211111131211113313331333132313331333112233232123121222322   <<    C12313211232233312111111312111133133313331323133313331122332321231212223223   >>      C12313211232233312111111312111133133313331323133313331122332321231212223222   >>