What are the room numbers and corresponding buildings for classrooms which can seat between 50 to 100 students?
return classrooms ;return students #1 can seat ;return #1 where #2 is  at least 50 ;return #1 where #2 is  at most 100 ;return #1 of  both #3 and  #4 ;return room number of  of  #5 ;return buildings of  #5 ;return #6 ,  #7
['select', 'project', 'comparative', 'comparative', 'intersection', 'aggregate', 'project', 'union']