There are three blocks, A, B and C. Block A has a medium black square. Above block A we have block B. It contains a medium blue square and a medium black square. Below the medium black square there is the medium blue square. Finally, there is block C below block A. It contains a medium black square and a medium yellow square. The medium black square is touching the bottom edge of this block. It is below the medium yellow square.
What is below the blue thing? a medium black square that is in block B or a medium black square that is in block A?
medium black square  that is in block B medium black square  that is in block A both of them none of them