What is the customer id with most number of cards, and how many does he have?
return customers ;return cards of  #1 ;return number of  #2 for each  #1 ;return #1 where #3 is  highest ;return customer id of  #4 ;return cards of  #4 ;return number of  #6 ;return #5 ,  #7
['select', 'project', 'group', 'superlative', 'project', 'project', 'aggregate', 'union']