Which country does customer with first name as Carole and last name as Bernhard lived in?
return customers ;return first names of #1 ;return #1 where #2 is  Carole ;return last names of #1 ;return #1 where #4 is  Bernhard ;return country of both #3 and #5
['select', 'project', 'comparative', 'project', 'comparative', 'intersection']