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