Which players scored touchdowns between 20 and 30 yards long in the first half?
return players ;return touchdowns of #1 ;return #2 in  the  first half ;return yards of #3 ;return #1 where #4 is at least 20 ;return #1 where #4 is at most 30 ;return #1 in  both #5 and  #6
['select', 'project', 'filter', 'project', 'comparative', 'comparative', 'intersection']