Show the publishers that have publications with price higher than 10000000 and publications with price lower than 5000000.
return publishers ;return publications of #1 ;return prices of #2 ;return #1 where #3 is  higher than 10000000 ;return #1 where #3 is  lower than 5000000 ;return #1 of both #4 and #5
['select', 'project', 'project', 'comparative', 'comparative', 'intersection']