Show the country where people older than 30 and younger than 25 are from.
return people ;return #1 older than  30 ;return #1 younger than  25 ;return the  countries that  #2 are from ;return the  countries that  #3 are from ;return the  countries in both #4 and #5
['select', 'filter', 'filter', 'project', 'project', 'intersection']