There is a large cube resting behind the large gray sphere and in front of the large green metallic cylinder; what is it's color?
return spheres ;return #1 that are gray ;return #2 that are large  ;return cylinders ;return #4 that are large  ;return #5 that are green ;return #6 that is metallic ;return cubes ;return #8 that are large  ;return #9 that is behind #3 ;return #10 that is in  front of  #7 ;return color of  #11
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