If the left image shows at least one pair of knee caps that are being worn on a person's legs
return the  left image ;return pairs of knee caps in  #1 ;return people in  #1 ;return legs of #3 ;return #2 being worn on #4 ;return number of  #5 ;return if  #6 is at least one
['select', 'project', 'project', 'project', 'filter', 'aggregate', 'boolean']