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