Task: Question Generation
Input (English): #1 return balls 
#2 return sizes of #1 
#3 return materials that  #1 are made of 
#4 return #1 where  #2 are the  same  
#5 return #1 where  #3 are the  same  
#6 return #1 in  both  #4 and #5 
#7 return number of #6
Output (English): How many balls are of the same size and made of the same material?