What are the positions with both players having more than 20 points and less than 10 points.
return positions ;return players of #1 ;return points  of #2 ;return #2 where #3 is  higher than 20 ;return #2 where #3 is  lower than 10 ;return #1 of both #4 and #5
['select', 'project', 'project', 'comparative', 'comparative', 'intersection']