There are three blocks. We call them A, B and C. Block A contains two medium yellow squares. Medium yellow square number one is below a medium blue square and medium yellow square number two. Below the medium blue square there is medium yellow square number two. Then, there is block B. It contains two medium yellow squares. Below medium yellow square number two is medium yellow square number one. Finally, we have block C above block A and to the left of block B. It has a medium black square.
What is below the blue shape? a medium black square or a medium yellow square?
medium black square  medium yellow square  both of them none of them