If one of the knee braces has a hole in the front so the knee cap is showing.
return knee  braces ;return front of #1 ;return #1 where  #2 has a  hole ;return knee  cap ;return #3 so #4 is showing ;return number of  #5 ;return if  #6 is equal to  one
['select', 'project', 'comparative', 'select', 'filter', 'aggregate', 'boolean']