Show the name and phone of the customer without any mailshot.
return customers ;return mailshots of #1 ;return number of  #2 for each #1 ;return #1 where #3 is  at least one ;return #1 besides #4 ;return names of #5 ;return phones of #5 ;return #6 ,  #7
['select', 'project', 'group', 'comparative', 'discard', 'project', 'project', 'union']