We have three blocks. Lets call them A, B and C. Block A contains a medium black square and a medium blue square. The medium black square is below the medium blue square. Then, there is block B with one medium blue square and a medium yellow square in it. Below the medium yellow square there is the medium blue square. Above block A and below block B there is block C. It contains one medium yellow square.
Which object is below a medium yellow 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