question: What shape metal object has two of the same color?
#1 return objects 
#2 return #1 that  are metal 
#3 return colors of #2 
#4 return number of  #2 for each #3 
#5 return #3 where #4 is  two 
#6 return #2 where #3 is  #5 
#7 return the  shapes of #6