We have two blocks, A and B. Block A contains one medium yellow square. Above block A there is block B. It contains two medium blue squares. Medium blue square number one is below a medium black square and a medium yellow square. Below the medium black square there is medium blue square number two. The medium yellow square is below medium blue square number two and the medium black square.
What is below the black object? a medium yellow square which is in block A or a medium yellow square that is in block B?
medium yellow square  which is in block A medium yellow square  that is in block B both of them none of them