What are the unique ids of those departments where any manager is managing 4 or more employees.
return departments ;return managers of  #1 ;return employees #2 manage ;return number of  #3 for each  #2 ;return #1 where #4 is  at least 4 ;return unique ids of  #5
['select', 'project', 'project', 'group', 'comparative', 'project']