There are three blocks, A, B and C. A medium black square is in block A. Then, we have block B. It contains a medium yellow square. It also contains one medium blue square. Below the medium yellow square there is the medium blue square. Finally, we have block C above block A and block B is above it. It has two medium yellow squares. Below medium yellow square number two there is medium yellow square number one.
What is below the blue thing? a medium yellow square or a black thing?
medium yellow square  black thing both of them none of them