What are the positions of both players that have more than 20 20 points and less than 10 points?
return players ;return points  of #1 ;return #1 where #2 is higher than 20 ;return #1 where #2 is lower than 10 ;return positions of #3 ;return positions of #4 ;return #5 ,  #6
['select', 'project', 'comparative', 'comparative', 'project', 'project', 'union']