We have two blocks. We call them A and B. Block A has a medium black square. Block B is below block A. It contains two medium blue squares and two other medium yellow squares. Medium blue square number one is touching the bottom edge of this block. Medium blue square number two is below medium yellow square number two. Medium yellow square number one is below medium yellow square number two. Medium blue square number one is below medium yellow square number two and medium blue square number two. Medium blue square number two is below medium yellow square number one.
What is above the thing that is touching the bottom edge of a block? a medium black square or a medium yellow square?
medium black square  medium yellow square  both of them none of them