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