There are three blocks. We call them A, B and C. Block A has a medium black square. Below block A there is block B. It contains two medium yellow squares. Below medium yellow square number one there is a medium blue square. Medium yellow square number one is below medium yellow square number two. The medium blue square is below medium yellow square number two. Below block A there is block C which has one medium black square. The medium black square is touching the bottom edge of this block. This block also has a medium blue square. Below the medium blue square is the medium black square.
Which object is below 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