We have three blocks. Lets call them A, B and C. Block A has a medium blue square. Block B is below block A. It has one medium blue square. This block also has a medium yellow square. Below the medium yellow square there is the medium blue square. Above block A there is block C which contains one medium black square. One medium blue square is also in this block. Below the medium blue square is the medium black square.
Which object is above a medium blue square? the medium black square or the medium yellow square?
the medium black square  the medium yellow square  both of them none of them