We have three blocks, A, B and C. Block A has one medium blue square. Below block A there is block B. It contains one medium blue square. Finally, there is block C. It is above block A. It contains two medium black squares. Medium black square number one is below medium black square number two. This block also contains a medium yellow square. Below medium black square number two and medium black square number one is the medium yellow square.
Which object is above a medium blue square? medium black square number one or medium black square number two?
medium black square  number one medium black square  number two both of them none of them