Show names of shops that have more than one kind of device in stock.
return shops ;return devices of #1 ;return #2 that  are in stock ;return kinds of #3 ;return number of  #4 for each #1 ;return #1 where #5 is  higher than one ;return names of #6
['select', 'project', 'filter', 'project', 'group', 'comparative', 'project']