What is the customer id, first and last name with most number of accounts.
return customers ;return accounts of #1 ;return number of  #2 for each #1 ;return #1 where #3 is the  highest ;return customer id of #4 ;return first name of #4 ;return last name of #4 ;return #5 ,  #6 ,   #7
['select', 'project', 'group', 'comparative', 'project', 'project', 'project', 'union']