There are three blocks, A, B and C. Two medium black squares are in block A. Below medium black square number two is medium black square number one. Block B is below block A. It contains one medium yellow square. Finally, we have block C above block B. It contains one medium yellow square and one medium blue square. Below the medium blue square there is the medium yellow square.
Which object is above a medium yellow 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