We have two blocks. We call them A and B. Two medium yellow squares are in block A. Below medium yellow square number two is medium yellow square number one. A medium black square is below medium yellow square number one , medium yellow square number two and a medium blue square. It is touching the bottom edge of this block. The medium blue square is below medium yellow square number two. Below block A there is block B which contains one medium black square and a medium yellow square. The medium black square is touching the bottom edge of this block. This object is below the medium yellow square.
Which object is below a medium black square? medium yellow square number two or the medium yellow square that is in block B?
medium yellow square  number two the medium yellow square  that is in block B both of them none of them