C12313211232233312111111312111133133313331323221312132223222121   >>    C1231321123223331211111131211113313331333132322131213222322212   <<    C12313211232233312111111312111133133313331323221312132223222123   >>      C12313211232233312111111312111133133313331323221312132223222122   >>