Find products with max page size as "A4" and pages per minute color smaller than 5.
return products ;return max page size of #1 ;return pages per minute color of #1 ;return #1 where #2 is equal to A4 ;return #1 where #3 is less than 5 ;return #1 in  both #4 and  #5
['select', 'project', 'project', 'comparative', 'comparative', 'intersection']