C12313211232233312111111312111133133313331323133323132213233232211223321   >>    C1231321123223331211111131211113313331333132313332313221323323221122332   <<    C12313211232233312111111312111133133313331323133323132213233232211223323   >>      C12313211232233312111111312111133133313331323133323132213233232211223322   >>