question: There are three small balls; how many of them are the same material as the small blue cube?
#1 return balls 
#2 return size of #1 
#3 return #1 where #2 is small  
#4 return cubes 
#5 return #4 that are blue 
#6 return size of #5 
#7 return #5 where #6 is small  
#8 return material of #3 
#9 return materials of #7 
#10 return number of  #3 where #8 is the  same as #9