Show the name and country for all people whose age is smaller than the average.
return people ;return ages of #1 ;return average of #2 ;return #1 where #2 is lower than #3 ;return names of #4 ;return countries of #4 ;return #5 ,  #6
['select', 'project', 'aggregate', 'comparative', 'project', 'project', 'union']