Task: Question Generation
Input (English): #1 return the  sphere in  front 
#2 return the  object behind of #1 
#3 return objects 
#4 return #3 besides  #2 
#5 return material of #2 
#6 return materials of #4 
#7 return #4 where #6 is the  same as #5 
#8 return number of  #7
Output (English): How many objects are the same material as the one behind the sphere in front?