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