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