C12313211232233312111111312111133133313331323133313332221331213132233231   >>    C1231321123223331211111131211113313331333132313331333222133121313223323   <<    C12313211232233312111111312111133133313331323133313332221331213132233233   >>      C12313211232233312111111312111133133313331323133313332221331213132233232   >>