We have three blocks. Lets call them A, B and C. A medium black square and a medium blue square are in block A. Below the medium blue square is the medium black square. Above block A there is block B with one medium black square and a medium blue square in it. Below the medium blue square is the medium black square. Finally, there is block C. It is above block B. It contains a medium black square.
Which object is below a medium black square? the medium blue square that is in block A or the medium blue square that is in block B?
the medium blue square  that is in block A the medium blue square  that is in block B both of them none of them