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