Task: Question Generation
Input (English): #1 return exhibitions 
#2 return attendances of #1 
#3 return number of  #2 for each #1 
#4 return #1 where #3 is  below 100 
#5 return #1 where #3 is  above 500 
#6 return #1 of both #4 and #5 
#7 return themes for #6
Output (English): Show the theme for exhibitions with both records of an attendance below 100 and above 500.