C12313211232233312111111312111133133313331323133323132213233232132212131   >>    C1231321123223331211111131211113313331333132313332313221323323213221213   <<    C12313211232233312111111312111133133313331323133323132213233232132212133   >>      C12313211232233312111111312111133133313331323133323132213233232132212132   >>