question: What is the shape of the two rubber objects which share a color?
#1 return objects 
#2 return #1 that are rubber 
#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 the  same as #5 
#7 return shape of #6