Show first name and id for all customers with at least 2 accounts.
return customers ;return accounts of #1 ;return number of #2 for each #1 ;return #1 where #3 is  at least 2 ;return first names of #4 ;return ids of #4 ;return #5 , #6
['select', 'project', 'group', 'comparative', 'project', 'project', 'union']